![]() Second, create another table named product that stores the product data. ![]() ![]() For example, products with the grand luxury segment have 5% discount while luxury and mass products have 6% and 10% discounts respectively. The product_segment table has the discount column that stores the discount percentage based on a specific segment. We will use the following database tables for the demonstration:įirst, create a new table called product_segment that stores the product segments including grand luxury, luxury, and mass. Let’s take a look at an example to understand how the PostgreSQL UPDATE join works. If the value in the c2 column of table t1 equals the value in the c2 column of table t2, the UPDATE statement updates the value in the c1 column of the table t1 the new value ( new_value). The FROM clause must appear immediately after the SET clause.įor each row of table t1, the UPDATE statement examines every row of table t2. To join to another table in the UPDATE statement, you specify the joined table in the FROM clause and provide the join condition in the WHERE clause. In this case, you can use the PostgreSQL UPDATE join syntax as follows: UPDATE t1Ĭode language: SQL (Structured Query Language) ( sql ) Sometimes, you need to update data in a table based on values in another table. Introduction to the PostgreSQL UPDATE join syntax Summary: in this tutorial, you will learn how to use the PostgreSQL UPDATE join syntax to update data in a table based on values in another table.
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