boyfriend什么意思两个sql查询语句之间的左连接leftjoin
代码如下:
⼦查询内部也使⽤了左连接
lect a.id, a.thumbNail,a.name,a.berPrice ,a.personName,a.portSendDate,b. (lect od.id, ps.thumbNail,ps.name,od.berPrice ,od.personName,od.portSendDa der_detail od
LEFT der_logistics ol
ieveOrderLogisticId = ol.id
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LEFT JOIN orders.product_snapshot ps
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on od.productSnapShotId=ps.id
hateyou出国留学英语口语WHERE od.valid=true and ol.valid=true derId=? ) a
left join
(ackNumber ,od.id der_detail od LEFT der_logistics ol portSendOrderLogisticId=ol.id where od.valid=true and ol.v on a.id=b.id
INNER 等价于
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你可以理解为 是 INNER JOIN 的缩写
JOIN 等价于 OUTER JOIN
满足澳大利亚留学条件有什么JOIN 等价于 OUTER JOIN品tang
逗号与inner等同,即只查询两表条件均满⾜的数据。lanier
法国国庆日left join,左表数据多于右表
right join,与left join相反
full join,即是left join和right join的并集