记一次MySQL查询优化(GROUP BY)
价格表
CREATE TABLE `electricprice` (
`ID` int NOT NULL AUTO_INCREMENT,
`PriceName` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
`PriceValue` float NULL DEFAULT NULL,
`PriceUnit` varchar(255) CHARACTER SET utf8 COLLATE .
原创
2021-12-16 11:26:34 ·
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