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07.23.2007 at 11:45AM PDT, ID: 22715046
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7.6

Is the SQL valid if the field referenced in the SQL does not contain value

Asked by dmissel in SQL Query Syntax, Oracle Database

I have the following SQL:

SELECT *
FROM   (SELECT EMP_ID,
               EMP_NAME,
               EMP_FULLNAME FULL_NAME
        FROM   EMPLOYEE,
               PAY_GROUP
        WHERE  EMPLOYEE.PAYGRP_ID = PAY_GROUP.PAYGRP_ID
               AND (PAY_GROUP.PAYGRP_SUPERVISOR_DATE < EMPLOYEE.EMP_TERMINATION_DATE
                     OR PAY_GROUP.PAYGRP_SUPERVISOR_DATE < EMPLOYEE.EMP_FLAG17)
               AND EXISTS (SELECT 0
                           FROM   SEC_EMPLOYEE
                           WHERE  WBU_ID = 31909
                                  AND SEC_EMPLOYEE.EMP_ID = EMPLOYEE.EMP_ID));

My question is regarding the following line:

(PAY_GROUP.PAYGRP_SUPERVISOR_DATE < EMPLOYEE.EMP_TERMINATION_DATE
                     OR PAY_GROUP.PAYGRP_SUPERVISOR_DATE < EMPLOYEE.EMP_FLAG17)

If the EMPLOYEE.EMP_TERMINATION_DATE is NULL, is the statement correct as is or is there a way in SQL to interrogate the field and only execute if there is a values.

The same question applies to the PAY_GROUP.PAYGRP_SUPERVISOR_DATE < EMPLOYEE.EMP_FLAG17 statement, but the additional problem is that the EMPLOYEE.EMP_FLAG17 field is a varchar and not a date.

Thanks in advance for the help
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[+][-]07.23.2007 at 12:06PM PDT, ID: 19550385

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Zones: SQL Query Syntax, Oracle Database
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Solution Provided By: awking00
Participating Experts: 3
Solution Grade: A
 
 
[+][-]07.23.2007 at 12:36PM PDT, ID: 19550702

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[+][-]07.23.2007 at 12:39PM PDT, ID: 19550729

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[+][-]07.23.2007 at 12:42PM PDT, ID: 19550760

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[+][-]07.24.2007 at 03:44AM PDT, ID: 19554863

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[+][-]07.24.2007 at 05:43AM PDT, ID: 19555479

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