MySQL UPDATE: Replace Table Data

To replace data in a MySQL table, you can use the UPDATE statement. Here is the basic syntax for the UPDATE statement.

UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;

table_name is the name of the table where the data will be replaced, column1, column2 are the column names to be updated, value1, value2 are the updated values, and condition is the criteria used to specify the rows to be updated.

For example, if there is a table named ‘customers’ with columns id, name, and email, you can update the name of the row with id=1 to “John” using the following statement:

UPDATE customers SET name = 'John' WHERE id = 1;

To update values for multiple columns, you can use comma to separate each column’s assignment statement. For example, to update the name to “John” and email to “john@example.com” for the row with id 1, you can use the following statement:

UPDATE customers SET name = 'John', email = 'john@example.com' WHERE id = 1;

To replace data in all rows of a table, you can omit the WHERE clause, for example:

UPDATE customers SET name = 'John', email = 'john@example.com';

This will update the values of the name and email columns for all rows in the table to “John” and “john@example.com”. Please note that without specifying a WHERE clause, the update operation will affect all rows in the table. So, when using the UPDATE statement, make sure to handle it carefully to avoid accidentally replacing data that should not be updated.