layout: global title: IF statement displayTitle: IF statement license: | Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Executes lists of statements based on the first condition that evaluates to true.

This statement may only be used within a compound statement.

Syntax

IF condition  THEN { stmt ; } [...]
  [ { ELSEIF condition THEN { stmt ; } [...] } [...] ]
  [ ELSE { stmt ; } [...] ]
  END IF

Parameters

  • condition

    Any expression evaluating to a BOOLEAN.

  • stmt

    A SQL statement to execute if the condition is true.

Examples

> BEGIN
    DECLARE choice DOUBLE DEFAULT 3.9;
    IF choice < 2 THEN
      VALUES ('one fish');
    ELSEIF choice < 3 THEN
      VALUES ('two fish');
    ELSEIF choice < 4 THEN
      VALUES ('red fish');
    ELSEIF choice < 5 OR choice IS NULL THEN
      VALUES ('blue fish');
    ELSE
      VALUES ('no fish');
    END IF;
  END;
 red fish

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