Question

SQL FIDDLE http://sqlfiddle.com/#!2/cbebfb/1

我在ProductTemp中使用SKU＆＃34; Fruits＆amp ;;坚果礼品篮＆＃34;其中ProductID = 1。

ProductId 1＆＃34; Fruits＆amp; Nuts Gift Basket＆＃34;由14个包含ProductNo＆＃s;（525,535,523,502,506,526,524,515,520,514,532,527,497,526）的儿童产品组成。

如果任何儿童产品（水果或坚果）数量低于规定的阈值（例如小于3），请设置＆＃34;水果和水果。 Nuts Gift Basket＆＃34;，ProductID 1活动状态TO＆＃34; 0＆＃34;。

期望的结果：我想禁用＆＃34; Fruits＆amp;坚果礼品篮＆＃34;如果任何儿童产品低于阈值。

UPDATE ProductTemp
     SET Active = CASE
        WHEN (ProductNo) = (535) AND (Quantity < 3) THEN 0
        WHEN (ProductNo) = (525) AND (Quantity < 3) THEN 0
        WHEN (ProductNo) = (523) AND (Quantity < 2) THEN 0
        WHEN (ProductNo) = (526) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (524) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (502) AND (Quantity < 2) THEN 0
        WHEN (ProductNo) = (515) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (506) AND (Quantity < 2) THEN 0
        WHEN (ProductNo) = (520) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (514) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (532) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (527) AND (Quantity < 1) THEN 0
        WHEN (ProductNo) = (497) AND (Quantity < 1) THEN 0
        ELSE Active
      END
    WHERE ProductID = 1

我还修改了@strawberry提供的重构查询

UPDATE ProductTemp SET Active = CASE WHEN (ProductNo IN(535,525) AND Quantity < 3) OR (ProductNo IN(523,502,506) AND Quantity < 2) OR (ProductNo IN(526,524,515,520,514,532,527,497) AND Quantity < 1) THEN 0 ELSE Active END WHERE ProductID = 1; 运行上面的查询---＆＃34; 0行受影响的行匹配：1更改：0警告：0＆＃34;

Answer 1

顺便说一句，我认为你的查询可以改写如下......

UPDATE my_table 
   SET active = CASE WHEN (ProductNo IN(535,525) AND Quantity < 3) 
                       OR (ProductNo IN(523,502,506) AND Quantity < 2) 
                       OR (ProductNo IN(526,524,515,520,514,532,527,497) AND Quantity < 1) 
                     THEN 0 ELSE active
                 END;

参考下面的评论，并举例说明，请考虑以下内容......

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(product_no INT NOT NULL PRIMARY KEY,quantity INT NOT NULL);

INSERT INTO my_table VALUES (35,4),(525,2);

SELECT * FROM my_table;
+------------+----------+
| product_no | quantity |
+------------+----------+
|         35 |        4 |
|        525 |        2 |
+------------+----------+

SELECT *,(product_no IN(35,525) AND quantity < 3) x FROM my_table;
+------------+----------+---+
| product_no | quantity | x |
+------------+----------+---+
|         35 |        4 | 0 |
|        525 |        2 | 1 |
+------------+----------+---+

mysql update 1记录基于多个其他记录的值

1 个答案: