MySQL 存儲過if語句用法
阿新 • • 發佈：2018-10-04
elseif custom ble latin roc where varchar 文章 用法 MySQL 存儲過if語句用法，MySQL IF語句允許您根據表達式的某個條件或值結果來執行一組SQL語句。
SET p_customerLevel = ‘GOLD‘;
ELSEIF creditlim < 10000 THEN
SET p_customerLevel = ‘SILVER‘;
END IF;
1，if 結構
IF expression THEN
statements;
END IF;
IF expression THENstatements;
ELSE
else-statements;
END IF;
IF expression THEN
statements;
ELSEIF elseif-expression THEN
elseif-statements;
ELSE
else-statements;
END IF;
2，if實例
DELIMITER $$CREATE PROCEDURE GetCustomerLevel(
in p_customerNumber int(11),
out p_customerLevel varchar(10))
BEGIN
DECLARE creditlim double;
SELECT creditlimit INTO creditlim
FROM customers
WHERE customerNumber = p_customerNumber;
IF creditlim > 50000 THENSET p_customerLevel = ‘PLATINUM‘;
SET p_customerLevel = ‘GOLD‘;
ELSEIF creditlim < 10000 THEN
SET p_customerLevel = ‘SILVER‘;
END IF;
END$$
if用在存儲過程中，多多實際實踐，增加動手能力
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MySQL 存儲過if語句用法