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Editorial Team
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Asked: 2026-06-17T18:30:53+00:00

I have a Customer table, my client want to not physically delete any record

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I have a Customer table, my client want to not physically delete any record from this table so I use a TINYINT field “IsDeleted” to keep track of deleted customers.

Now i m in a situation where i need to exclude Deleted Customers but when i tired following Query it gives me less number of records

select count(*) from customer where IsDeleted <> 1; (Count = 1477)

then the following

select count(*) from customer where (IsDeleted = 0 or IsDeleted is  null); (Count = 1552)

why the above query counts are different?
why “NULL” value is not counted in ” IsDeleted <> 1″ check?

Please suggest.

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1 Answer

  1. Editorial Team

    Like Duniyadnd and triclosan point out this is caused by the column type for IsDeleted.
    Change the query in the right panel so you can see the difference between using int and varchar column types. sqlfiddle.com/#!2/7bf0a/5

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