How to use calculated column value in where clause

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I need to retrieve data filtered by the results of a calculated column - how?

INFORMIX:

SQL

SELECT
    TUP_TAG_NO AS TAG,
    (
        CASE
            (
                CASE (SELECT ttt_prnt_tag_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no) WHEN NULL THEN (SELECT MIN(pkc_cmpt_tag_no) FROM INTPKC_REC WHERE pkc_pkg_ctl_no = tup_itm_ctl_no GROUP BY pkc_pkg_ctl_no) ELSE (SELECT ttt_prnt_tag_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no) END )
                WHEN NULL
                THEN (SELECT TRIM(tag_mst_tag_no) FROM INTTAG_REC WHERE tag_itm_ctl_no = tup_itm_ctl_no)
                ELSE
                    (
                        CASE
                            (
                                SELECT tag_mst_tag_no
                                FROM
                                    INTTAG_REC
                                WHERE tag_itm_ctl_no =
                                                        (
                                                            CASE (SELECT ttt_itm_ctl_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no)
                                                                WHEN NULL
                                                                THEN (SELECT MIN(pkc_cmpt_ctl_no) FROM INTPKC_REC WHERE pkc_pkg_ctl_no = tup_itm_ctl_no GROUP BY pkc_pkg_ctl_no)
                                                                ELSE (SELECT ttt_itm_ctl_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no)
                                                            END
                                                        )
                            )
                            WHEN NULL
                            THEN (SELECT TRIM(atg_mst_tag_no) FROM INAATG_REC WHERE atg_itm_ctl_no =
                                                                                            (
                                                                                                CASE (SELECT ttt_itm_ctl_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no)
                                                                                                    WHEN NULL
                                                                                                    THEN (SELECT MIN(pkc_cmpt_ctl_no) FROM INTPKC_REC WHERE pkc_pkg_ctl_no = tup_itm_ctl_no GROUP BY pkc_pkg_ctl_no)
                                                                                                    ELSE (SELECT ttt_itm_ctl_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no)
                                                                                                END
                                                                                            )
                                )
                            ELSE
                            (
                                SELECT TRIM(tag_mst_tag_no)
                                FROM
                                    INTTAG_REC
                                WHERE tag_itm_ctl_no =
                                                        (
                                                            CASE (SELECT ttt_itm_ctl_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no)
                                                                WHEN NULL
                                                                THEN (SELECT MIN(pkc_cmpt_ctl_no) FROM INTPKC_REC WHERE pkc_pkg_ctl_no = tup_itm_ctl_no GROUP BY pkc_pkg_ctl_no)
                                                                ELSE (SELECT ttt_itm_ctl_no FROM INTTTT_REC WHERE ttt_itm_ctl_no = tup_itm_ctl_no)
                                                            END
                                                        )
                            )
                        END
            )
        END
    ) AS MASTER_TAG,
FROM
    TRJTUP_REC,
    TRJTUD_REC,
    TRJTPH_REC,
    INRFSH_REC,
    ARRCUS_REC,
    TCTNAD_REC

WHERE
    `MASTER` = '123456'

Posted 24-Sep-10 13:04pm

MeritUSA

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AspDotNetDev · Accepted Answer · 2010-09-24T16:02:00

Solution 1

I'm not familiar with INFORMIX, but it is done in SQL Server as follows:

SQL

SELECT
	(100 - YearsOld) AS YearsRemaining
FROM People
WHERE
	(100 - YearsOld) > 0

That is, you enter the calculation in the WHERE clause.

Posted 24-Sep-10 16:02pm

AspDotNetDev

Comments

MeritUSA 27-Sep-10 11:13am

Reason for my vote of 5
Automatic vote of 5 for accepting answer.