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1 lut 2010 · How do I update a table and set different values upon the condition evaluating to True. For instance : UPDATE Table SET A = '1' IF A > 0 AND A < 1 SET A = '2' IF A > 1 AND A < 2 WHERE A IS NOT NULL;
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;
The WHERE clause, if given, specifies the conditions that identify which rows to update. With no WHERE clause, all rows are updated. If the ORDER BY clause is specified, the rows are updated in the order that is specified. The LIMIT clause places a limit on the number of rows that can be updated.
Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated!
In this article, we would like to show you UPDATE query with IF condition in MySQL. Quick solution: UPDATE `table_name` SET `column_name` = IF(condition , if_true, if_false); Practical example. To show UPDATE query with IF condition, we will use the following users table:
3 paź 2019 · I ran the following statement in our test mysql database, it works properly. However, when I ran it in production, I got all rows, including those of CLASS = 'ClassName', updated with XML value set to 0 ! UPDATE table_name c set c.XML= REPLACE (c.XML, '<flag_name>false</flag_name>', '') WHERE c.CLASS = 'ClassName'.
17 maj 2024 · 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. If you skip this, it'll update all rows.
