Subquery works as unexpected

TEST_SAL
-------------------

EMP_ID, EMP_NAME EMP_SALARY EMP_DPT_ID EMP_LVL
---------------------- -------------------- ---------------------- ---------------------- -------
1. DOWNLOAD 10 5500 aaa
GET 2 2430 20 bbb
3 7000 10 E1 ccc
4 ddd 6600 20 E1
15000 30 E2 5 fff
6 ggg 40 30000 E3
7 60000 60 E3 hhh



GRADE_JOBS

GRADE_TYPE LOWEST_SALARY HIGHEST_SALARY EMP_NAME
---------- ---------------------- ---------------------- ---------------
A 3000 100 aaa
B 3001 5500 bbb
C 5501 7000 ccc
D 7001 9000 ddd
E 9001 15000 fff
A 2500 3000 aaa
A 2430 3000 aaa
F 9001 15000 ggg
G 2430 3000 hhh





Query 1:

Select *.
of grade_jobs
where grade_type = (select grade_type in the test_sal where emp_name = "bbb");


This request reflects the line in grade_jobs,

the column "grade_type" is not available in the 'test_sal' table, executing the subquery only he throws error INVALID IDENTIFIER

Note:

* When the parent ask the column and the column of query sub is even it the results all rows of the query of the mother



Query 2:

Select *.
of grade_jobs
where grade_type = (select grade_typ in the test_sal where emp_name = "bbb");

Note:

During the execution of this query lance identifier not VALID error as expected,



Query 3:



Select lowest_salary
of asapsu.grade_jobs
where emp_name = (select emp_name from asapsu.test_sal where grade_type = has ');


This request there is no such column one grade_type in the 'test_sal' table, instead of throwing his request is not a VALID identifier is to launch the error of application of line unique sub unexpectedly.


request 4:



Select lowest_salary
of asapsu.grade_jobs
where emp_name = (select emp_nam from the asapsu.test_sal where grade_type = has ');

In this query the column 'emp_nam' in the sub query does not match the parent query column. Now it is to launch the valid error
"Invalid identifier".



Need explanation:

In the above queries 4 If the name of the column the subquery is put in correspondence with the parent query column the sub query seems to be work even if it has invalid identifiers.

Need your explanation will help me understand the subquerys.

Thank you
Fabrice

Published by: 957595 on April 17, 2013 05:48

I haven't studied your post, but you must use aliases for tables and take advantage of all your columns with the alias.

It makes the query easier to understand and can make like easier to solve these problems.

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