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Editorial Team
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Asked: 2026-05-31T15:55:33+00:00

In my where clause, I have the following: where SharePt NOT LIKE ‘SharePoint Document%’

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In my where clause,
I have the following:

   where SharePt  NOT LIKE 'SharePoint Document%'

The result does not return anything even though SharePt is null.

But when I do the following it works
OR SharePtVer IS NULL

    where SharePt  NOT LIKE 'SharePoint Document%' OR SharePt  IS NULL

Wondering why NOT LIKE doesn’t work in terms of including a NULL>

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1 Answer

  1. Editorial Team

    SQL uses three-valued logic… NULL is not the same as FALSE, and NOT NULL is not the same as TRUE.

    NULL represents the absence of a value, and functions an unknown value in SQL’s three valued logic:

    A AND B | TRUE    | FALSE   | Unknown
--------+---------+---------+--------
TRUE    | TRUE    | FALSE   | Unknown
FALSE   | FALSE   | FALSE   | FALSE
Unknown | Unknown | FALSE   | Unknown


A OR B  | True    | False   | Unknown
--------+---------+---------+--------
True    | True    | True    | True
False   | True    | False   | Unknown
Unknown | True    | Unknown | Unknown

    When where SharePt NOT LIKE 'SharePoint Document%' is evaluated, if SharePt is NULL, or unknown… then the result would be unknown… SharePt may or may not be LIKE 'SharePoint Document%'.

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