You supply the value in each column’s assignment in the form of a literal value, an expression, or a subquery.
Third, you specify which rows will be updated using a condition in the WHERE clause.
My SQL UPDATE using NULL My SQL UPDATE command can be used to update a column value to NULL by setting column_name = NULL, where column_name is the name of the column to be updated.
The following My SQL statement will update pub_lang column with NULL if purch_price is more than 50.
The following code block has a generic SQL syntax of the UPDATE command to modify the data in the My SQL table − The WHERE clause is very useful when you want to update the selected rows in a table.
My SQL UPDATE with WHERE My SQL UPDATE command can be used with WHERE clause to filter (against certain conditions) which rows will be updated.
The following My SQL statement will update the 'receive_qty' column of newpurchase table with a new value 25 if the value of purch_price is more than 50.
Second, the SET clause specifies which column that you want to modify and the new values.
To update multiple columns, you use a list comma-separated assignments.