How Do I Check No. Of Records In Database Using Count() In Mysql

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I Want to Check the condition for BE_BookIssuestatus='A' using count

my query as follows

SQL

SELECT CASE WHEN Count(BE_BookIssuestatus IN('A')) > 0 THEN 'Available' ELSE 'Not Available' END BookStatus from BookEntity_Master

It returns Available When there is BE_BookIsseStatus not equal to 'A' in table,Any Suggestion for this to obtain 'Not Available' when there is no BookIsseStatus 'A'

Posted 27-Jan-14 23:16pm

SVT02

Updated 27-Jan-14 23:23pm

v2

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Vedat Ozan Oner · Answer 1 · 2014-01-27T23:55:00

Solution 1

change into (use of ISNULL)

SQL

SELECT CASE WHEN ISNULL(Count(BE_BookIssuestatus IN('A')),0) > 0 THEN 'Available' ELSE 'Not Available' END BookStatus from BookEntity_Master

Posted 27-Jan-14 23:55pm

Vedat Ozan Oner

Jorge J. Martins · Answer 2 · 2014-01-27T23:57:00

Hi, I woul sugest doing it with a subquery.
I will assume that there is some sort of ID column.
I don't know if, in this case, MS SQL SERVER is that different from MySQL, but here's a hint.

SELECT CASE ISNULL(A.QT, 0) WHEN 0 THEN 'Not Available' ELSE 'Available' END AS BookStatus FROM BookEntity_Master
LEFT OUTER JOIN (SELECT ID, Count(*) AS QT FROM BookEntity_Master WHERE BE_BookIssuestatus IN('A') GROUP BY ID) AS A
ON A.ID = BookEntity_Master.ID