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我有3個表SQL三個表
cl_address
:FK - cl_ser_id,FK - add_ser_idaddress
:PK - add_ser_idyouths_info
:FK - cl_ser_id
我會喜歡
select *
from youths_info
select *
from address
可以將某些大師請幫忙,並與代碼,並建議最優化的SQL?
下面是它的最後INNER JOIN
SELECT a.*, y.*
FROM [informix.address] a
INNER JOIN [informix.cl_address] cla ON a.addr_ser_id = cla.addr_ser_id
INNER JOIN [informix.cl_address] cla ON [youth_info] y
cla.cl_ser_id = y.cl_ser_id
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