The SET Clause

Use the SET clause to modify current values at the location pointed to by the cursor.

Syntax

EXEC SQL
    UPDATE tablename SET field = 'new_value'
...
END-EXEC

where

tablename is the name of the database table containing the data you want to update.

new_value is the new value you are assigning to that field.

EXEC SQL
    UPDATE CUSTOMER SET C_INFO = 'Revised' 
...
END-EXEC

This tells the update program to change the value of C_INFO in the customer table to Revised.