有没有一种方法可以根据另一个表中字段的值有条件地更改我要内部联接的表?这是我到目前为止得到的(但它是错误的):
SELECT
j.jobID, j.jobNumber,
CASE
WHEN j.idType = 'dealership' THEN d.dealershipName
WHEN j.idType = 'Group' THEN g.groupName
WHEN j.idType = 'Agency' then a.agencyName
END as dealershipName,
CASE
WHEN p.manualTimestamp != '0000-00-00 00:00:00' THEN UNIX_TIMESTAMP(p.manualTimestamp)
WHEN p.manualTimestamp = '0000-00-00 00:00:00' THEN p.timestamp
END as checkTS,
CONCAT_WS(' ', ui.fName, ui.lName) as salesRep
FROM jobs j
LEFT JOIN dealerships d ON j.dealershipID = d.dealershipID
LEFT JOIN dealershipgroups g ON j.dealershipID = g.groupID
LEFT JOIN agencies a ON j.dealershipID = a.agencyID
INNER JOIN payments p ON j.jobID = p.jobID
IF j.idType = 'dealership' THEN
INNER JOIN smdealershipjoins smdj ON j.dealershipID = smdj.dealership
INNER JOIN userinfo ui ON smdj.sm = ui.userID
ELSEIF j.idType = 'Group' THEN
INNER JOIN smgroupjoins gj ON j.dealershipID = gj.groupID
INNER JOIN userinfo ui ON gj.sm = ui.userID
ELSEIF j.idType = 'Agency' THEN
INNER JOIN smagencyjoins aj ON j.dealershipID = aj.agencyID
INNER JOIN userinfo ui on aj.sm = ui.userID
END IF
因此,有一个表(作业),其中包含 idType(经销商、团体或代理机构)和 clientID(称为经销商 ID)。我需要做的是加入某个表(基于 idType)来确定哪个销售经理“拥有”客户帐户。如果 idType = 'dealership' 我需要加入 smdealershipjoins,如果是 'Group' 我需要加入 smgroupjoins,如果是 'agency' 我需要加入 smagencyjoins,这样我就可以将该表加入到 userinfo 以获得销售额经理的名字。
我还尝试使用 case 语句进行内部连接,但这也给出了错误。
左/外连接到三个选项中的每一个,并且您选择的条件将处理其余的事情。
也许是这样的:
...
LEFT JOIN smdealershipjoins smdj
ON j.dealershipID = smdj.dealership
LEFT JOIN smgroupjoins gj
ON j.dealershipID = gj.groupID
LEFT JOIN smagencyjoins aj
ON j.dealershipID = aj.agencyID
LEFT JOIN userinfo ui
ON ui.userID = CASE
WHEN j.idType = 'dealership' THEN smdj.sm
WHEN j.idType = 'Group' THEN gj.sm
WHEN j.idType = 'Agency' then aj.sm
END
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