postgresql if else if else
CASE. The SQL CASE expression is a generic conditional expression, similar to if/else statements in other programming languages: CASE WHEN condition ... ,IF-THEN statements are the simplest form of IF. The statements between THEN and END IF will be executed if the condition is true. Otherwise, they are skipped. ,IF-THEN statements are the simplest form of IF. The statements between THEN and END IF will be executed if the condition is true. Otherwise, they are skipped. ,CASE. The SQL CASE expression is a generic conditional expression, similar to if/else statements in other programming languages: CASE WHEN condition ... ,IF-THEN-ELSE statements add to IF-THEN by letting you specify an alternative set of statements that should be executed if the condition is not true. (Note this ... ,IF-THEN-ELSE statements add to IF-THEN by letting you specify an alternative set of statements that should be executed if the condition is not true. (Note this ... ,IF-THEN statements are the simplest form of IF. The statements between THEN and END IF will be executed if the condition is true. Otherwise, they are skipped. ,PL/pgSQL IF THEN ELSIF THEN ELSE statement else-statement; ... For example, if the condition-1 , condition-2 , etc., is true then the corresponding statement: if-statement , elseif-statement-2 , etc., will execute. In case one condition is true, PostgreSQ, Try: DO $do$ BEGIN IF EXISTS (SELECT FROM orders) THEN DELETE FROM orders; ELSE INSERT INTO orders VALUES (1,2,3); END IF; ...,本節描述在PostgreSQL 裡可以用的SQL兼容的條件資料表達式。 ... SQL CASE 資料表達式是一種通用的條件資料表達式，類似於其它語言中的if/else 語句。 ... 如果沒有WHEN condition 為真，那麼 case 資料表達式的結果就是在ELSE 子句裡的值。
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 postgresql if else if else 相關參考資料
COALESCE() function - PostgreSQL
CASE. The SQL CASE expression is a generic conditional expression, similar to if/else statements in other programming languages: CASE WHEN condition ... https://www.postgresql.org Documentation: 7.2: Control Structures - PostgreSQL
IF-THEN statements are the simplest form of IF. The statements between THEN and END IF will be executed if the condition is true. Otherwise, they are skipped. https://www.postgresql.org Documentation: 8.0: Control Structures - PostgreSQL
IF-THEN statements are the simplest form of IF. The statements between THEN and END IF will be executed if the condition is true. Otherwise, they are skipped. https://www.postgresql.org Documentation: 8.4: Conditional Expressions - PostgreSQL
CASE. The SQL CASE expression is a generic conditional expression, similar to if/else statements in other programming languages: CASE WHEN condition ... https://www.postgresql.org Documentation: 9.0: Control Structures - PostgreSQL
IF-THEN-ELSE statements add to IF-THEN by letting you specify an alternative set of statements that should be executed if the condition is not true. (Note this ... https://www.postgresql.org Documentation: 9.1: Control Structures - PostgreSQL
IF-THEN-ELSE statements add to IF-THEN by letting you specify an alternative set of statements that should be executed if the condition is not true. (Note this ... https://www.postgresql.org Documentation: 9.4: Control Structures - PostgreSQL
IF-THEN statements are the simplest form of IF. The statements between THEN and END IF will be executed if the condition is true. Otherwise, they are skipped. https://www.postgresql.org PLpgSQL IF Statement - PostgreSQL Tutorial
PL/pgSQL IF THEN ELSIF THEN ELSE statement else-statement; ... For example, if the condition-1 , condition-2 , etc., is true then the corresponding statement: if-statement , elseif-statement-2 , etc.,... http://www.postgresqltutorial. PostgreSQL IF statement - Stack Overflow
Try: DO $do$ BEGIN IF EXISTS (SELECT FROM orders) THEN DELETE FROM orders; ELSE INSERT INTO orders VALUES (1,2,3); END IF; ... https://stackoverflow.com 條件資料表達式
本節描述在PostgreSQL 裡可以用的SQL兼容的條件資料表達式。 ... SQL CASE 資料表達式是一種通用的條件資料表達式，類似於其它語言中的if/else 語句。 ... 如果沒有WHEN condition 為真，那麼 case 資料表達式的結果就是在ELSE 子句裡的值。 http://twpug.net |