Question

我的名字是milind并尝试使用CASE和WHEN语句进行mysql UPDATE查询，我收到以下错误：

24 errors were found during analysis.

Unrecognized keyword. (near "CASE" at position 27)
Unrecognized keyword. (near "WHEN" at position 32)
Unexpected token. (near "id" at position 37)
Unexpected token. (near "=" at position 39)
Unexpected token. (near "'2'" at position 40)
Unrecognized keyword. (near "THEN" at position 44)
Unexpected token. (near "'Y'" at position 49)
Unrecognized keyword. (near "ELSE" at position 53)
Unrecognized keyword. (near "status" at position 58)
Unrecognized keyword. (near "END" at position 65)
Unexpected token. (near "," at position 68)
Unrecognized keyword. (near "status" at position 71)
Unexpected token. (near "!=" at position 78)
Unrecognized keyword. (near "CASE" at position 81)
Unrecognized keyword. (near "WHEN" at position 86)
Unrecognized keyword. (near "status" at position 91)
Unexpected token. (near "=" at position 98)
Unexpected token. (near "'2'" at position 99)
Unrecognized keyword. (near "THEN" at position 103)
Unexpected token. (near "'N'" at position 108)
Unrecognized keyword. (near "ELSE" at position 112)
Unrecognized keyword. (near "status" at position 117)
Unrecognized keyword. (near "END" at position 124)
Unexpected token. (near "," at position 127)

我的UPDETE查询如下：

UPDATE quotes SET status = CASE WHEN id='2' THEN 'Y' ELSE status END,
status = CASE WHEN id !='2' THEN 'N' ELSE status END,
WHERE id='2';

我希望更新where status = Y insted of status = N和stutus = N insted of status = Y.

Answer 1

您似乎误解了如何使用CASE语句。请参阅以下this MySQL tutorial

中的示例

DELIMITER $$

CREATE PROCEDURE GetCustomerShipping(
 in  p_customerNumber int(11), 
 out p_shiping        varchar(50))
BEGIN
    DECLARE customerCountry varchar(50);

    SELECT country INTO customerCountry
 FROM customers
 WHERE customerNumber = p_customerNumber;

    CASE customerCountry
 WHEN  'USA' THEN
    SET p_shiping = '2-day Shipping';
 WHEN 'Canada' THEN
    SET p_shiping = '3-day Shipping';
 ELSE
    SET p_shiping = '5-day Shipping';
 END CASE;

END$$

无法识别的关键字。用PHP

1 个答案: