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16 lip 2009 · Since MySQL 5.6.X you can do this: ALTER TABLE `schema`.`users`. CHANGE COLUMN `created` `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ; That way your column will be updated with the current timestamp when a new row is inserted, or updated.
Use of DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP is specific to TIMESTAMP and DATETIME. The DEFAULT clause also can be used to specify a constant (nonautomatic) default value (for example, DEFAULT 0 or DEFAULT '2000-01-01 00:00:00' ).
The typical way to do that is to create a stored procedure which inserts into/updates the target table, then updates the other row(s), all in a transaction. Another option for you might be the ON UPDATE constraint that you can add to your table.
CREATE TRIGGER tg_bi_table1 BEFORE INSERT ON table1 FOR EACH ROW SET NEW.d1 = DATE(NEW.dt1), NEW.d2 = DATE(NEW.dt2); CREATE TRIGGER tg_bu_table1 BEFORE UPDATE ON table1 FOR EACH ROW SET NEW.d1 = DATE(NEW.dt1), NEW.d2 = DATE(NEW.dt2);
MySQL comes with the following data types for storing a date or a date/time value in the database: DATE - format YYYY-MM-DD. DATETIME - format: YYYY-MM-DD HH:MI:SS. TIMESTAMP - format: YYYY-MM-DD HH:MI:SS. YEAR - format YYYY or YY.
27 sty 2024 · The created_at column records the time when a new record is inserted into a table, whereas the updated_at column records the time when any modification is made to the record. This tutorial covers how to implement and manage these temporal columns in MySQL 8.
11 gru 2017 · "if the incoming date matches with existing date, it should update the table and add incoming value to existing value else it should just insert" -- You have just specified what INSERT ... ON DUPLICATE KEY UPDATE ... does. Use that. this trigger works but how to include the ON DUPLICATE KEY UPDATE giving me tough time and dosent work out
