What is the name of this query
Hi all
I want to know the name of this query to learn about it, because I don't understand how it works.
Select the columns tab "(select table columns)" table.
I saw him, but I don't know how it works.
Thanks in advance
It is a scalar subquery expression.
"An expression of scalar subquery is a subquery that returns exactly one column of a line."
The value of the scalar subquery expression is the value of the select item from the list of the subquery.
If the subquery returns 0 rows, then the value of the scalar subquery expression is NULL.
If the subquery returns more than one line, then Oracle returns an error. »
See:
http://docs.Oracle.com/CD/E16655_01/server.121/e17209/expressions013.htm#SQLRF52093
For example, we can write
Select empno,
Ename,
DEPTNO,
(select dname dept where deptno = emp.deptno) dname
WCP
order by empno
/
Instead of
Select e.empno,
e.Ename,
e.DEPTNO,
d.DNAME
from emp e,.
d Dep.
where e.deptno = d.deptno
order by empno
/
Tags: Database
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========
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=========
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===========
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ConcerningFor wave_id = 51 there are 28466854 rows in "wave_result" table For wave_id = 51 and node_nbr = '0201' and prod_nbr = '0226960' there are 3 rows in "wave_result" table
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>
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>
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>
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