sql server - Sub query returning all values and then applying where condition -

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i having issue query in 1 particular environment/database if data similar. here simplified scenario:

table - 1 column - id (long)

id 1 2 3

table b - 2 columns - value(varchar) , field2(varchar)

  value field2 1)abc   notkey 2)test  notkey 3)1     key 4)1.56  notkey

when run query

select * table id in(select value table b field2 = 'key')

i error

result: conversion failed when converting varchar value 'abc' (earlier had value erraneously 'notkey') data type int.

on 1 database. in 3 other databases, value returns correctly "1".

i using sql server 2008. might issue here?

you gave wrong filter filter leads error.

the errror happens when select:

select * tablea id in(select value tableb field2 = 'notkey')

you have cast 1 of columns 

select * tablea cast( id nvarchar(20)) in(select value tableb field2 = 'notkey')

http://sqlfiddle.com/#!6/e9223/23


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