How to return true(1) or false(0) if a the records of a particular column are the same in the database

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SQL-Server-2014

i have a table that looks like this

CodeID                   Status
         
         FO1                      FREE
         
         FO2                      NOT FREE
        
         FO1                      FREE
        
         FO1                      FREE
        
         FO1                      FREE

What i want to achieve is check if in the above above all FO1 have status of Free. If are free, i want to carry out and action. I'm using asp.net web form for the application by way. Kindly help me out with how to structure my query to be able to tell if my all records for a particular value are the same

What I have tried:

select count(distinct Status) from TableName where CodeID = 'FO2' and Status ='FREE'

I'm testing with this query in SQL server just to be sure if what i'm doing is right. The above query returns 1 but if i change one of the FO1 to NOT FREE the above code stills returns 1. I want to make it return o.

Posted 25-Jul-17 4:11am

Mcbaloo

Updated 25-Jul-17 4:30am

v3

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OriginalGriff · Accepted Answer · 2017-07-25T04:30:00

Solution 2

The way I'd do it is to use GROUP BY:

SQL

SELECT COUNT(Status) FROM TableName GROUP BY CodeID, Status HAVING CodeID = 'F01' AND Status != 'FREE'

A value of 0 indicates all F01 are FREE (or there are no F01 codes) any other number is a NOT FREE F01.

Posted 25-Jul-17 4:30am

OriginalGriff