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11 gru 2011 · ALTER TABLE yourtable ADD INDEX date_time (date_time); Once you do these things, THEN you can create a query with a WHERE clause that looks like this: WHERE date_time >= '2011-12-11 23:00:00'. AND date_time < '2011-12-12 23:00:00'. If you cannot combine the date and time fields, you can still create an index.
18 lis 2015 · WHERE timestamp >= CURDATE() AND timestamp < CURDATE() + INTERVAL 1 DAY. To show the difference that this makes on the actual execution plans, we'll test with an SQL-Fiddle(an extremely helpful site): CREATE TABLE test --- simple table ( id INT NOT NULL AUTO_INCREMENT ,`timestamp` datetime --- ...
26 sty 2024 · Comparing and Filtering Time. Frequently, queries necessitate filtering rows based on time. We can use CURTIME() or CURRENT_TIME() in a WHERE clause for such operations. SELECT * FROM task_log WHERE task_time < CURTIME(); This query will retrieve all tasks that were logged before the current time.
1 sty 2018 · How to Query Date and Time in MySQL. MySQL has the following functions to get the current date and time: SELECT now(); -- date and time SELECT curdate(); --date SELECT curtime(); --time in 24-hour format. To find rows between two dates or timestamps: SELECT * FROM events.
Definition and Usage. The CURRENT_TIME () function returns the current time. Note: The time is returned as "HH-MM-SS" (string) or as HHMMSS.uuuuuu (numeric). Note: This function equals the CURTIME () function.
26 sty 2024 · The NOW() function in MySQL returns the current date and time as a ‘YYYY-MM-DD HH:MM:SS’ format. It is a non-deterministic function, which means it returns a different value every time it is called, based on the current date and time.
17 lis 2023 · The CURRENT_TIME() function in MySQL returns the current time in ‘HH:MM:SS’ format. It can be used to insert or query time values based on the current time.
