Like query with multiple columns

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SQL

select * from tblBusinessCategory as b
inner join tblUser as u
on b.BusinessID=u.BusinessCategoryId
inner join tblAddress as a
on u.AddressId=a.AddressID
where u.BusinessCategoryId in (select BusinessCategory from tblBusinessCategory where BusinessCategory LIKE '%d%')

While doing this query i got

#1 ) Conversion failed when converting the nvarchar value 'Dentist' to data type int. how to solve this ??
#2 ) How to perform like operation on multiple columns??
#3 ) Is this possible to call this query in mvc4 controller ??

Posted 16-Aug-15 23:01pm

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Maciej Los · Accepted Answer · 2015-08-16T23:51:00

Why to use subquery to filter data, if you can use a "condition" directly?!?

SQL

select *
from tblBusinessCategory as b
    inner join tblUser as u on b.BusinessID=u.BusinessCategoryId
    inner join tblAddress as a on u.AddressId=a.AddressID
where b.BusinessCategory LIKE '%d%'

Please, take a look at this excellent article: Visual Representation of SQL Joins[^] to understand how join's work.

#1 ) Conversion failed when converting the nvarchar value 'Dentist' to data type int. how to solve this ??
BusinessCategoryId is not the same as BusinessCategory. To be able to get proper data, you have to write:

SQL

where u.BusinessCategoryId in (select BusinessCategoryId from tblBusinessCategory where BusinessCategory LIKE '%d%')

But! I do not recommend to use subquery like this, because of performance issue!

#2 ) How to perform like operation on multiple columns??
Write proper WHERE statement!

SQL

WHERE ((Column1 Like '%a' AND (Column2 = 1 OR Column3 = 2)

#3 ) Is this possible to call this query in mvc4 controller ??
I do not understand you... ;(