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23 cze 2013 · I am trying to UPDATE values from a table, but I need to add some conditions. I found the function CASE , but I am not if it is the best method. Here is an example.
UPDATE my_table SET comments = GREATEST(CAST(comments AS signed)-3, 0) WHERE something = 123; or the IF() function: UPDATE my_table SET comments = IF(comments>3, comments-3, 0) WHERE something = 123;
For the single-table syntax, the UPDATE statement updates columns of existing rows in the named table with new values. The SET clause indicates which columns to modify and the values they should be given.
17 maj 2024 · Syntax: Updating a column with a NULL value in MySQL is surprisingly straightforward. Check out this basic syntax: UPDATE table_name. SET column_name= 'N/A'. WHERE condition; table_name: The name of your table. column_name: The column you want to turn into NULL. condition: When you want to be selective.
16 kwi 2016 · However, given how the conditions are re-used in your UPDATE statement, you could also take a different approach altogether: represent the affected IDs and the new values as a derived table and use an update with a join:
The MySQL UPDATE Statement. The UPDATE statement is used to modify the existing records in a table. UPDATE Syntax. UPDATE table_name. SET column1 = value1, column2 = value2, ... WHERE condition; Note: Be careful when updating records in a table! Notice the . WHERE clause in the UPDATE statement.
19 lip 2012 · @Cade Roux's solution gives me a syntax error, the correct one for mysql 5.5.29 is: UPDATE ips INNER JOIN country ON ips.iso = country.iso SET ips.countryid = country.countryid without the "FROM" keyword.
