mysql timestampdiff seconds. The following query selects all rows with a date_col value from within the last 30 days: . mysql timestampdiff seconds

 
 The following query selects all rows with a date_col value from within the last 30 days: mysql timestampdiff seconds The main problem is as follows: In order to find the difference between days you need to use datediff(); datediff() returns the difference in days

Here’s a quick rundown of the functions you can use in MySQL: ## #TIMESTAMPDIFF TIMESTAMPDIFF() returns the difference in the given unit. 1 why does mysql timediff function give wrong output? Load 7 more related questions Show. Posted on Oct 19, 2021. Intervals store things internally as months, days, and seconds. Share. Some days have an extra second or two seconds depending on the year. Seconds, Minutes, Hours, Days, Weeks,. 2. 1) Last updated on APRIL 12, 2021. Aurora MySQL also supports DATE_SUB for subtracting date parts from a date time expression. The second parameter of DATEDIFF takes a datetime so your string is implicitly converted to a datetime. The TIMESTAMPDIFF() function will then return the difference in the specified unit. For example if the result is 490 seconds, since it is greater than 59. I currently developed a cron that runs every 1 minute to analyze the last 60 seconds of the bot records in database, I need to group the conversation ID's that have more than 3 records within 60 seconds in the same url and client_session_id. Since TIMESTAMP in mysql is stored as a 32bit value representing the time interval from 1970-jan-1 0:00:00 in seconds, I assumed that using minus (-) operator on TIMESTAMP values would give the difference of these values in seconds. Your code is right, TIMESTAMPDIFF () returns a value after subtracting a datetime expression from another. YEAR ('2015-01-01') returns 2015, which is not a valid date, which breaks timestampdiff () causing it to return NULL. SELECT TIMESTAMPDIFF (SECOND, '2010-01-01 10:10:20', '2010-01-01 10:45:59') AS SECONDDIFFERENCE; 1 Answer. TIMESTAMPDIFF not working on mysql query in codeigniter. So maybe this problem has. But the output I get is 1 (day). SELECT * FROM schedule WHERE TIMESTAMPDIFF(SECOND,dateTime,TIMESTAMP('2015-01-31 10:00:00'))>0The UNIX_TIMESTAMP() function, an intrinsic feature of MySQL, offers an elegant solution for converting a TIMESTAMP column into seconds since the Unix epoch. To get the corrected TIMESTAMPDIFF, I therefore multiply the number of Saturdays, Sundays and holidays by 24 to get the number of hours to be subtracted, then subtract that number from the TIMESTAMPDIFF. 7 Reference Manual :: 12. . Here expr2 is greater than expr1, so the return value is positive. Use DSL. For example: Check in date is 12-04-2010 Check out date 15-04-2010 The day difference would be 3. If you want the difference between just two times like '11:10:00' minus '10:20:00' then use select TIME_TO_SEC('11:10:00')-TIME_TO_SEC('10:20:00') Discussion: To calculate the difference between the timestamps in MySQL, use the TIMESTAMPDIFF (unit, start, end) function. If you have a variable holding another UNIX_TIMESTAMP, you can get the difference and turn seconds to minutes (and round/truncate the result if needed): SELECT ROUND ( (UNIX_TIMESTAMP ()-1506947452) / 60, 0) Share. 3. TIMESTAMPDIFF(unit, timepoint1, timepoint2): returns the number of time units (SECOND, MINUTE, HOUR, DAY, MONTH or YEAR) between timepoint1 and timepoint2 . by Nathan Sebhastian. Alternatively, you can use either of the functions TIMESTAMPDIFF() and UNIX_TIMESTAMP(), both of which return integers. MySQL is quite different from SQLite. types. For example, if we want to know the difference between two dates in seconds: SELECT id, job, TIMESTAMPDIFF(SECOND, start_date, end_date) AS runtime FROM example_table; This calculates end_date - start_date in. SEC_TO_TIME(MOD(TIMESTAMPDIFF(SECOND,start_time,end_time),24*60*60)) The hour portion could still be less than two digits, so you could apply the same pattern as. DATE () Extract the date part of a date or datetime expression. startdate = 2010-02-23 02:59:52. Description. ) to use for determining the difference. I am using MySQL. TIMESTAMPDIFF in a php foreach-loop. One expression may be a date and the other a datetime; a date value is treated as a datetime having the time part '00:00:00' where necessary. You can also phrase this without a function on one of the columns by just sing date arithmetic: where c2 <= c1 + interval 30 minute; The advantage of avoiding a function is that MySQL can -- in some circumstances -- take advantage of an index on one of the columns. Here is an example that uses date functions. use TIMESTAMPDIFF. Example: As an example, if timestamp A is 14:00 on Friday and timestamp B is 14:01 on Tuesday, the raw TIMESTAMPDIFF is. TIMEDIFF('00:04:50','23:59:59');. +1 for to the point the stored timestamp is less than x minutes. The unit argument can be MICROSECOND, SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR. numeric-expression. TIMESTAMPDIFF() : Esta función en MySQL se usa para devolver un valor después de restar una expresión DateTime de otra. If you have a number of milliseconds since the Unix epoch, try this to get a DATETIME (3) value. seconds, minutes, hours, etc. microseconds. Tham số unit được sử dụng để định nghĩa đơn vị của giá trị được trả về. TIME_TO_SEC (TIMEDIFF (endDate, startDate))/3600 as hours. If the business would like to round up each login_datetime value to 15 minute interval, we can apply the following logics. 0. The output is 510 because start value is 29/10/2012 05:13. Is there any way around this so the result of the query can go. ), the start timestamp, and the end timestamp. . Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Reading time: 2 minutes. Share. 0. e. One may be a date and another is datetime. status_timestamp < tmain. I have currently logged more than 900 hours of work this year though, and I want the result of my query to reflect this. 2022/11/26. MySQL where datediff equals to some value. 4. The unit argument can be MICROSECOND , SECOND , MINUTE , HOUR , DAY , WEEK , MONTH , QUARTER , or YEAR . 3 Answers. The format of a TIMESTAMP is YYYY-MM-DD HH:MM:SS which is fixed at 19 characters. It returns an integer as a result. MariaDB :addYears, addQuarters, addMonths, addWeeks, addDays, addHours, addMinutes, addSeconds, addMilliseconds, addMicroseconds, addNanoseconds. 12:25 occurred with 12 minutes and 25 seconds left, etc. The timestamp difference returns the difference between two dates in seconds. Then it adds the number of the full days to the starting time and reduces the closing time my the sum, so what remains is the time in the current day. Note: You need to pass two date / datetime values along with the unit (eg, day, month, etc. , begin is a DATE value and end is a DATETIME value. Convert from date to epoch. userid,cb_users. So subtracting a TIMESTAMP WITH TIME ZONE that is 5 am Eastern from a TIMESTAMP WITH TIME ZONE that is 2 am Pacific will result in an interval of 0. I need to produce a recordset that gives me the time between prints in seconds. @Enrico - Not true. 0 and later) An implementation of . 1 Answer. You can use the MySQL HOUR(), MINUTE() and SECOND() functions to break the time returned from SEC_TO_TIME into its components. Another argument provides the unit for the result. Syntax. use TIMESTAMPDIFF. start, c1. TIMESTAMPDIFF () in MySQL returns a value after dividing one DateTime expression by another. . You still need to divide it by 60 and round the result. Follow. EXTRACT. TIMESTAMPDIFF ( numeric-expression string-expression. The function subtracts one datetime value from the other in the specified unit. fin,NEW. DATE_SUB () Subtract a time value (interval) from a date. MySQL MySQLi Database. Default: 10; Maximum idle connections: The total number of connections allowed to be idle at a given time. 1. Because of two reasons: MySQL's built-in functions UNIX_TIMESTAMP and FROM_UNIXTIME take the time zone stored in @@global. Requires 3 arguments. SET @date1 = '2010-10-11 00:00:00', @date2 =. SELECT * FROM tableName WHERE TIMESTAMPDIFF (MINUTE,timestamp,NOW ()) < 10. e . Improve this answer. I've been busy with this for hours, but I cant get it to work. To achieve this, we will utilize the MySQL DATEDIFF () function to calculate their ages: SELECT CONCAT (first_name, ' ', last_name) AS full_name, birth_date, FLOOR (DATEDIFF (CURRENT_DATE, birth_date) / 365) AS age FROM employees; In this query, the DATEDIFF () function calculates the number of days between the current date and the birth_date. About;. Example 1 – Basic Difference Here’s an example that demonstrates the basic difference between these functions. 1、此函数的参数具有混合类型,比如 begin 是DATE值,end 可以是 datetime 值。. The value specifies the interval that is used. You need to use the function available in your db in the below queryset. If you divide until day, you are fine (every single day every year has the same amount of seconds). So I used TIMESTAMPDIFF in seconds. . Change the unit time to second and then convert the diff second to time. TimeStamp1,t2. SELECT DATEDIFF ('2010-01-01 00:00:00', '2009-01-01 00:00:00') * 24 + EXTRACT (HOUR FROM '2010-01-01 00:00:00') - EXTRACT (HOUR FROM '2009-01-01 00:00:00') Another. At least these are real and true seconds, unlike the MySQL DATEDIFF where they are. is_ignored IS NULL AND r. So in case we want to calculate a gap greater than 838 hours we need s olution, which could be the following one: # Number of days * 24 + time difference. 21. Use this version: CONCAT ( TIMESTAMPDIFF (day, TIME_START, TIME_END), 'd ', MOD (TIMESTAMPDIFF (hour, TIME_START, TIME_END), 24), 'h ', MOD (TIMESTAMPDIFF (minute, TIME_START,. For example: select col1, avg (timestampdiff (SECOND, startTimestamp, endTimestamp)) as avgdiff from table group by col1. which is why you have to time_to_sec,. 59) %T: Time, 24-hour (hh:mm:ss) %U: Week (00. It is to be noted that two expressions must be the same type. MySQL Database: Restore Database. According to the documentation, the first argument can be any of the following: MICROSECOND SECOND MINUTE HOUR DAY WEEK MONTH QUARTER YEAR2 Answers. MySQL timestampdiff() 函数就比 datediff() 功能强多了,datediff() 只能计算两个日期(date)之间相差的天数。Adds the integer expression interval to the date or datetime expression datetime_expr. minutes = total_seconds DIV 60. To get the difference in seconds as we have done here, choose SECOND . SELECT t1. I ran this on a shared server from the ISP JustHost, MYSQL version 5. This will provide you a whole number: SELECT TIMESTAMPDIFF (WEEK, date1, date2) AS weeks; To include a fraction for days, use: SELECT TIMESTAMPDIFF (DAY, date1, date2) / 7 AS weeks_days; or a fraction for seconds, use: SELECT TIMESTAMPDIFF (SECOND, date1, date2) / 604800 AS weeks_secs; as 604800 is 7 *. -- ===== Remove the "x" from my email address Jerry Stuckle JDS Computer Training Corp. If you want to read about CONVERT () and CAST () here is the link. The following table, based on the MySQL manual, describes the format specifiers:. If I understood him correctly, he wants to get the difference between these timestamps in seconds. Before MySQL 5. so actually you are doing. Similar to Timo Kähkönen's answer, I've used TIMESTAMPDIFF to determine if a date is valid like ISDATE does. The. I would recommend you to use the query like this: SELECT DATE(tbl. SELECT * FROM tableName WHERE TIMESTAMPDIFF (MINUTE,timestamp,NOW ()) < 10. 0. . 2. 6 Reference Manual. 647 seconds. 21. id WHERE p. Let us first create a table −. 32. MySQL TIMESTAMPDIFF Function Example SELECT TIMESTAMPDIFF(SECOND,’2013-01-14 10:59:10′, ‘2013-01-17 11:50:34’); #262284. So basically what this query does is that it calculates days by deducing dates in the first line. Share. Share. The table set might indeed become large in the long run, so that is why this answer is a little bit more usefull for me than the other, though appreciate Sebastian's answer aswell. montant / (datediff (NEW. 6. Starting with your example query, something like this would probably work: SELECT foo FROM table t LEFT JOIN frequencies f USING (frequency_id) WHERE MOD ( (CASE. 이 외에도 차이를 연, 분기, 월, 주, 일, 시, 분, 초를 지정하여 가져올 때 사용하는 함수가 timestampdiff. In MySQL SUBTIME() function tutorial, we would love to share with MySQL SUBTIME() function with its syntax, definition, parameters, and several examples. So I used TIMESTAMPDIFF in seconds. When you insert a TIMESTAMP value into a table, MySQL. Apr 4, 2018 at 6:36. Definition and Usage The TIMEDIFF () function returns the difference between two time/datetime expressions. net. Returns the interval from datetime_expr2 to datetime_expr1. So, to get results that we need we can calculate the TIMESTAMPDIFF between some anchor datetime and CreatedDate and UpdatedDate instead of calculating the difference between CreatedDate and. SELECT id, Present, Date, Time, SEC_TO_TIME (TIMESTAMPDIFF. In applications that involve event scheduling, DATE_ADD () helps determine future event dates based on specified intervals. Actually the data type for the columns is TIME, and this a sample of data stored: 07:11:40 07:11:56. It effectively calculates the difference in seconds and divides (discarding the fractional part) by the number of seconds in the chosen unit. TIMESTAMPDIFF ( unit type, datetime expression1, datetime expression2); Unit is used to express the difference of datetime or date in days, months, etc. select t. 097332 trigger_time = 2021-10-10 14:11:13. Select TIMESTAMPDIFF (SECOND, TIME (a. Here's the sql:. status_timestamp) FROM t tsub WHERE tsub. 2. edited Aug 21, 2018 at 17:38. MySQL TIMEDIFF () returns the differences between two time or datetime expressions. To get Current timezone of the mysql you can do following things: SELECT @@system_time_zone; # from this you can get the system timezone SELECT IF (@@session. PHP MySQL TIMESTAMPDIFF with seconds not working. 6 Answers. The supported range is '1000-01-01 00:00:00' to '9999-12-31 23:59:59'. ) operation (opens new. 1. DATEADD. I have tried this using TIMESTAMPDIFF(microsecond,Start,End)as diff but it is to milliseconds and I don't know how to convert it to "ss. MM. – Mehran. 4. status_timestamp) as last_timestamp FROM t tmain. SELECT TIMESTAMPDIFF (MONTH, '2012-05-05', '2012-06-04') -- Outputs. For example, if you wanted to calculate the difference between two timestamps in seconds, you would use the following query: SELECT TIMESTAMPDIFF (SECOND, start_timestamp. end) as elapse from c1) dfMySQL. Look at the documentation for TIMESTAMPDIFF () TIMESTAMPDIFF (unit,datetime_expr1,datetime_expr2) Returns datetime_expr2 − datetime_expr1, where datetime_expr1 and datetime_expr2 are date or datetime expressions. Yes, because the timestamp handles the leap years. 0 [Release 1. SELECT UNIX_TIMESTAMP (timestring) Time format: YYYY-MM-DD HH:MM:SS or YYMMDD or YYYYMMDD. NOW (3) will give you the present time from your MySQL server's operating system with millisecond precision. createDate) maxDt FROM Impressions i INNER JOIN carts c ON (i. Instead, the result is 838:59:59, which makes sense because that is the limit. About; Products For Teams; Stack Overflow. m. What this allows you to do is pass in two TIMESTAMP or DATETIME values (or even DATE as MySQL will auto-convert) as well as the unit of time you want to base your difference on. 4. The MySQL TIMESTAMP is a temporal data type that holds the combination of date and time. 私の実行系では TO_SECONDS() と同じ結果が得られました; Conclusion. Note: Basically, you provide a number of seconds as an argument, and it will change it to a time value. 6 Answers Sorted by: 11 You could use the native TIMESTAMPDIFF function : SELECT TIMESTAMPDIFF (<INTERVAL>,<timestampFrom>,<timestampTo>); If you want to find the difference between the first and the last timestamp of a given host ID, here you are: SELECT TIMESTAMPDIFF (MINUTE,MIN (pingtime),MAX (pingtime)) FROM yourTable WHERE host = 2; Share Fractional seconds for TIME , DATETIME, and TIMESTAMP values are supported, with up to microsecond precision. id_participant = p. INT TIMESTAMPDIFF(unit, DATETIME datetime_expr1, DATETIME datetime_expr2) Returns datetime_expr2 − datetime_expr1, where datetime_expr1 and datetime_expr2 are date or datetime expressions. seconds, minutes, hours, etc. The Syntax. You specify the unit to add, as well as how many of that unit to add. datediff() not ignoring time. Conclusion. Use a proper datetime type instead. Alternative for DATEDIFF. PHP MySQL TIMESTAMPDIFF with seconds not working. timestamp,f. Return values from temporal functions include fractional seconds as appropriate. 1. I a few seconds after I accepted the other one, you update your answer with a nice explaination. timestampdiff() 语法 这是 mysql timestampdiff() 函数的语法:I want to update the datetime round to 15 minutes in a MYSQL database table. createDate), AVG(TIMESTAMPDIFF(SECOND, tbl. end) as elapse from c1) df MySQL. Then you can convert seconds to minutes, or days, or months, or etc within your case statement, depending where they fall in the range. Follow. 3. Definition and Usage. Thanks, this answer works aswell. UNIX_TIMESTAMP () : This function in MySQL helps to return a Unix timestamp. It's a powerful tool for performing date and time calculations, allowing you to manipulate temporal data in various ways. 6. MySQL only supports microsecond for a higher resolution, but you can achieve it by converting microsecond to millisecond manually: SELECT TIMESTAMPDIFF (MICROSECOND, now (3), updated_at) / 1000 AS diff_in_ms FROM events; Share. Usage and definition for TIMESTAMPDIFF function (Doc ID 2756136. Learn more about TeamsFor millisecond, the maximum difference between startdate and enddate is 24 days, 20 hours, 31 minutes and 23. 1 Mysql 5. Here’s an example that returns the difference in minutes. This method returns the difference between two dates in the units supplied as the first parameter. 1 Answer. 001) Javascript timestamps, for example, are represented in milliseconds since the Unix epoch. timestampDiff (timestamp1, timestamp2). TIMESTAMPDIFF ( numeric-expression string-expression. SELECT TIMESTAMPDIFF(SECOND, NOW(), UTC_TIMESTAMP()); Add the result of the above to any unix timestamp if you want to compare it to MySQL DateTimes. What I have written is : date_diff ('minute',payment_time,trigger_time) <= 15 I basically want the count of users who paid within 15 mins of the triggered time thus I. my approach : set unit as SECOND and then use SEC_TO_TIME. Combine SUB_DATE AND TIMEDIFF to substract 1 hour in mysql. end, TIMESTAMPDIFF(MINUTE,c1. More information on time_format:. In SQL Server, you can use DATEDIFF function to get the datetime difference in specified units. Note: Since the the Unix Epoch date is based on UTC, when your MySQL server uses a timezone with an offset, using FROM_UNIXTIME(seconds - seconds_from_epoch), the resulting datetime will be off by that offset. The schema is SYSIBM. DATE_ADD () Add time values (intervals) to a date value. Q&A for work. Teams. sql. email FROM cb_sessions LEFT JOIN (cb_user. – Ihor Romanchenko. To get the difference in seconds as we have done here, choose SECOND . 0 to 11. TiDB 支持使用 MySQL 5. The TIMESTAMPDIFF function returns the. 212k 129 690 1515. 7. The MySQL server can be run with the MAXDB SQL mode enabled. Modified 9 years ago. Now if. Use: SELECT to_Char (start_dte,'DD. x -- here's an example : Erratic behaviour of TIMESTAMPDIFF() Note that MySQL 5. Before MySQL 5. It will return the difference in terms of an INTERVAL DAY TO SECOND type: org. Immutable if start and end dates are TIMESTAMP; Stable if start and end dates are TIMESTAMPTZ; SyntaxFor MySQL The TIMESTAMPDIFF is the native MySQL function which returns the difference between two given timestamps (one timestamp is subtracted from the other) for the specified date part interval (seconds, days, weeks, etc. minutes = total_seconds DIV 60. SELECT datedifference (date1, date2) FROM. One month is considered elapsed when the calendar month has increased and the calendar day and time is equal or greater to the start. Note: time1 and time2 should be in the same format, and the. This method returns the difference between two dates formatted as hours:minutes:seconds. Follow. In this case, TIMESTAMP is identical with DATETIME. sql console application and it supposed to show it as requested. date_time_1 & date_time_2 - The date and time. The two expressions don’t have to be of the same type. You probably want to use timestampdiff () select DriverName, CarType, min (timestampdiff (second, StartTime, EndTime)) as Best, max (timestampdiff (second, StartTime, EndTime)) as Worst from followingtable ft group by DriverName, CarType; If you want to show the value as a time format: select DriverName, CarType, date_format (cast. If you divide until day, you are fine (every single day every year has the same amount of seconds). objects. id) FROM. 0. INTERVAL allows either YEAR and MONTH to be mixed together or DAY, HOUR, MINUTE and SECOND. Im not sure if using "AS thisisit" is a current function of TIMESTAMPDIFF but I. My SQL query is correct in answers alone but when it comes to the format it fails. Practice. Example of the possible combinations below: Interval. MySQL uses the TIMESTAMPDIFF function to calculate the difference between two dates or datetimes: SELECT TIMESTAMPDIFF(unit, startdate, enddate) FROM table_name; Where unit represents the unit of time, like YEAR, QUARTER, MONTH, WEEK, DAY, HOUR, MINUTE, or SECOND. 584817 (and false logins) followed by user 4357 at 2021-09-03 22:41:43. TIMESTAMPDIFF. The avg function works like any other aggregate function, and will respond to group by. Month-difference between any given two dates: Have a look at the TIMESTAMPDIFF () function in MySQL. Using TIMESTAMPDIFF : NOTE:- Following Assumptions are made for TIMESTAMPDIFF () function. So we could modify the previous example so that TIMESTAMPDIFF. You may convert operands to TIMESTAMP, substract (obtaining the difference in seconds) and convert to hours. SELECT id, timeIn, timeOut, TIMEDIFF ( timeOut, timeIn ) AS timeDifference FROM table WHERE TIMESTAMPDIFF ( SECOND, timeOut, timeIn ) > 180000; This statement will output the fields for each record where the difference between the two timedates is one second or more over 50 hours (or 180000 seconds ). MySQL. SQL query TIMESTAMPDIFF with php not working. = 1-- Query using TIMESTAMPDIFF() # Write your MySQL query statement below. Description. Mysql TIMESTAMPDIFF for time datatype return negative value. For Example: If the dateTime is 2013-10-08 10:36:00, I want to convert it into 2013-10-08 10:30:00 Similarly,2013-10-08 10:22:00 to 2013-10-08 10:15:00. DATETIME: used for values that contain a date and time. user where createddate >= '2019-09-01' and createddate <= '2019-09-30'. TIMESTAMPADD () Examples – MySQL. 01 sec) Share. You can use the MySQL HOUR(), MINUTE() and SECOND() functions to break the time returned from SEC_TO_TIME into its components. 3. MySQL DATEDIFF: Calculate Days Between Two Dates. SELECT TIMESTAMPDIFF(MINUTE,'2022-02-01 10:30:27','2022-02-01 10:45:27') AS 'Difference in Minutes'; Result: +-----+ | Difference in Minutes | +-----+ | 15 |. TRUNC(TIMESTAMPDIFF(seconds,min(BE. The Syntax MySQL's TIMESTAMPDIFF () method is defined with the following syntax, accepting three required parameters: SELECT TIMESTAMPDIFF (unit,. The function counts whole elapsed units based on UTC with a DAY being 86400 seconds. 1 called TimeStampDiff (abbreviated TSD here), you can easily get this value. The following query selects all rows with a date_col value from within the last 30 days: . Follow. Actually i need to get the time difference between date_time field to now() so i used this query SELECT `date_time`,now(),timediff(`. DateDiff to show Minutes and Seconds. end_date - INTERVAL (q. 7 Date and Time Functions. Please follow up in a Java newsgroup. Sorted by: 18. Syntax : DATEDIFF ( datepart , startdate , enddate ) You should use TIMEDIFF() or TIMESTAMPDIFF() function. Result is expressed as a time value (and it has the limitations of the time. 0. Note: You need to pass two date / datetime. SELECT TIMESTAMPDIFF. SELECT a. SUBTIME () is valuable for making precise adjustments to time values, such as subtracting seconds, minutes, or hours. I have the following select statement where I subtract timestamps for knowing how long a truck has been stopped at a location: SELECT f. 0), 1) AS "Worked Hours" FROM `db_foo` WHERE matriculation='X' AND date='2017-yy-yy'; which would return. SELECT TIMESTAMPDIFF(HOUR, '2010-11-29 13:13:55', '2010-11-29 13:16:55') as newtable; | newtable | 7 1 row in set (0. Q&A for work. COALESCE (TIMESTAMPDIFF (SECOND,time_in1,time_out1),0) + COALESCE (TIMESTAMPDIFF (SECOND,time_in2, time_out2),0) This works if you want to use zero. g.