`petid` LEFT JOIN ON `pet_info`.`id` = `pet_images`.`petid` WHEN `pet_info`.syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CAS
有没有办法计算一个只有一个查询和多个条件的表中的记录,这些条件会像这样重叠在一起 select @count1 = count(1) from table_name where condition1select @count3 = count(1) from table_name where condition1 and condition2 and condition3
select @count4 = count(1) from table
我尝试使用CASEWHEN语句来确定将哪个表用于连接的后半部分。例如,有3个表: TableA、TableB、TableC。SELECT a.column1, b.column2TableA as aCASEWHEN condition1 THEN TableB as bID: 1 2 3ID: 1 2 3
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Select MAX(CASEWHEN e.attributedefinitionid = 15 THEN e.AttributeValueCASEWHEN e.attributedefinitionid = 143 THEN e.AttributeValue END) AS ItalianWording, MAX(CASEWHEN l.
这会创建一个段,说明订单是否具有2+单位: CASEWHEN SUM(quantity) > 1 then '2+ Units' ELSE '1 Unit' END as qty_flag_total我有一个产品‘自行车’的数量总和: SUM(CASEWHEN category = 'bike' THEN quantity END) AS qty_bike 但是想知道是否有一种干净的方法在这个上面创建相同的标志