Which will execute first

Hai,
I am having Where class and having class in a single select query.. Which will execute at first.

user12283394 wrote:
Hai,
I am having Where class and having class in a single select query.. Which will execute at first.select deptno, min(SAL), max(SAL) FROM EMP WHERE job='CLERK' group by deptno having count(*) > 3;
You should read basic sql query comment..
Refer :-
http://dbis.ucdavis.edu/courses/sqltutorial/tutorial.pdf
Regards
Azar
DBA

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here , see below snap from that URL.
in your case, the order will be
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Please mark the post as answer if this answers your question. If this post is helpful, please vote as helpful by clicking the upward arrow mark next to my reply.

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Hi all,
Select empno
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(select 1
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I have a doubt regarding the execution of above SQL.
During execution of WHERE clause
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correlated sub query will execute first
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Weather correlated subquery will execute for only one employee of 5 million employees.
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I have some sqls which look like this
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user645399 wrote:
When I deal with very large tables I notice that it takes too long, so was wondering if I move the table join to the and clause, it can join and then apply the filter which could be faster instead of filtering and joining the table.Define "+too long+" - what metric and baseline are used?
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But "+too long+" gives no indication what the workload is. And "+large table+" is meaningless as a SQL against a billion row table can be minimal workload (e.g. unique index read), whereas a SQL against a small table can be a huge workload (e.g. cartesian join and full table scan).
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I have no idea on how is the execution plan.And one of the first steps is looking at the execution plan. SQL code is source code (like C/C++ or Visual Basic source code). This cannot be executed - it needs to be parsed and compiled into an executable program.
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Which will execute first

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