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When I try to update only the missing data the non-matched data is also updated but to NULL. The reason some of your rows are getting NULLs updated is due to the subquery.

When the subquery fails to find a matching row in tbl B, the subquery returns NULL.

The SELECT clause displays the table before the updates. The FROM clause specifies EMPLOYEES as the table to select from. The UPDATE statement updates the values in EMPLOYEES.

The SET clause specifies that the data in the Salary column be multiplied by 1.04 when the job code ends with a 1 and 1.025 for all other job codes.

As a best practice, there are two main steps that you must follow to create and run an update query: create a select query that identifies the records that you want to update, and then convert that query to an update query that you can run to update the records.

Tip: You might want to back up your database before you run an update query.

sql queries for updating column values-2sql queries for updating column values-90

To add new records to a database you use an append query, and to delete whole records from a database you use a delete query.The ALTER TABLE statement specifies EMPLOYEES as the table to alter.The MODIFY clause permanently modifies the format of the Salary column.The first syntactical form, called a searched update, updates the value of one or more columns for all rows of the table for which the WHERE clause evaluates to TRUE.The second syntactical form, called a positioned update, updates one or more columns on the current row of an open, updatable cursor.

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