mysql - 为什么我在 mysql 中的这个查询中出现语法错误

Question

DB 新手，我正在编写查询，但需要帮助找出语法错误。查询:

SELECT IF (EXISTS(SELECT * FROM contact_address WHERE ad_ct_id = 1)) THEN
BEGIN
UPDATE contact_address set ad_city = 'Iraq'
END
ELSE
BEGIN
INSERT INTO contact_address (ad_ct_id, ad_type, ad_city)
VALUES (1, 'o', 'Iraq')
END
END IF;

错误:

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') THEN
BEGIN
UPDATE contact_address set ad_city = 'Iraq'
END
ELSE
BEGIN
INSERT I' at line 1

谢谢

Answer 1

删除SELECT。

IF (EXISTS(SELECT * FROM contact_address WHERE ad_ct_id = 1)) THEN
BEGIN
    UPDATE contact_address set ad_city = 'Iraq'
END
ELSE
BEGIN
    INSERT INTO contact_address (ad_ct_id, ad_type, ad_city)
    VALUES (1, 'o', 'Iraq')
END
END IF;