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Results tagged with Search options user 136

An SQL join clause combines records from two or more tables or views.

4
votes
Let me try to describe it a bit more intuitive. The inner join shows the users, which have one or more telephone(s) together with their telephone number(s). The left outer join additionally list those 'users' which have no telephone. …
answered Jan 4 '11 by bernd_k
8
votes
What your query is looking for is just SELECT EMP_NAME FROM EMPLOYEE e WHERE E.EMPLOYEE_ID = 123 and exists (select * from EMP_PROJ where EMPLOYEE_ID = 123); or SELECT EMP_NAME FROM EMPLOYEE …
answered Oct 29 '11 by bernd_k
11
votes
I tried to perform the mechanical process. I hope I remember it right. This leads to: SELECT ... FROM A join B on A.A_ID = B.A_ID left join C on B.B_ID = C.A_ID and B.B_KEY = C.B_KEY … and 'CONSTANT' = C.X_ID left join D on C.C_ID = D.C_ID left join E on B.A_ID = E.A_ID and B.B_KEY = E.B_KEY In short I think Leigh Riffel's answer is correct. Note in old days the rule to …
answered Jan 8 '11 by bernd_k