PROC SQL: Beyond the Basics Using SAS®

6.4. Updating Data in a Table

Once a table is populated with data, you may need to update values in one or more of its rows. Column values in existing rows in a table can be updated with the UPDATE statement. The key to successful row updates is the creation of a well-constructed SET clause and WHERE expression. If the WHERE expression is not constructed correctly, the possibility of an update error is great.

Suppose all laptops in the PRODUCTS table have just been discounted by 20 percent and the new price is to take effect immediately. The update would compute the discounted product cost for “Laptop” computers only. For example, the discounted price for a laptop computer would be reduced to $2,720.00 from $3,400.00.

SQL Code

PROC SQL;
  UPDATE ...