The WITH clause allows you to specify one or more subqueries that can be referenced by name in the UPDATE query. To designate results based on specified text criteria. Active 6 years, 8 months ago. The PostgreSQL IN operator checks whether a given value is exist or not in the list of values provided. UPDATE employees SET status = 'Active' WHERE (first_name = 'Jane' or last_name = 'Doe') AND employee_id > 1000; This PostgreSQL AND & OR condition example would update all status values to 'Active' in the employees table where the either the first_name is 'Jane' or last_name is 'Doe' and the employee_id is greater than 1000. It allows you to add if-else logic to the query to form a powerful query. Notice that in both of these past 2 examples, we are not merely filtering down the data, but rather returning all the data with new conditional information implemented on it. Last modified: December 10, 2020 • Reading Time: 4 minutes. When the goal is simply to filter down results, using a WHERE clause is usually the best method. CASE WHEN condition THEN result [WHEN ...] [ELSE result] END CASE clauses can be used wherever an expression is valid. To perform grouping (as shown in the examples below). Let us consider a simple example. There may be times when addressing more complex situations that it may be applicable as a better approach. The query in the example effectively moves rows from COMPANY to COMPANY1. A DML statement is executed when you: 1. Learn about PostgreSQL queries with useful 50 examples. Otherwise, all the rows would be updated. Postgresql condition on subquery results. Postgres allows you to use conditional logic in your SQL queries. If the condition evaluates to false, the control is passed to the next statement after the END if part. 0. how to execute multiple statement in PostgreSQL. I've injected it into the SP and I set a Raise info to note when it fires, but in running the stored proc it never fires. Remove existing rows from a table. Let’s say that we had the following data and wanted to group the results into regions based on their location. 9.16.1. In this syntax: First, specify the name of the table that you want to update data after the UPDATE keyword. CASE. The condition is a boolean expression that evaluates to true or false. You could also use the DEFAULT keyword to set a column to its default value. If we wanted to return all records with a location of either San Francisco or Los Angeles, it could be done like this: Given this simplicity of the sample data, in this case, perhaps it would make more sense to have just used a single SELECT statement with a single WHERE clause containing an OR condition. 3. select * from table2; With the use of Redshift WHILE statement, you can loop through a sequence of statements until the evaluation of the condition expression is true. You can combine N number of conditions using AND or OR operators. You can apply WHERE condition to apply UPDATE only on those values that satisfy the condition in WHERE clause. CONTINUE label; For example, CONTINUE simple_loop_continue_test WHEN (cnt > 10); Redshift WHILE Loop Statement. Modify existing rows in a table. Syntax: Each condition is an expression that returns a boolean result. PostgreSQL UPDATE query is used to update column values of a table. 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