How to return only mismatched columns

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Hi,

i have two identical tables called master and new.when i update master table its should compare with new table and return only mismatched columns.

What I have tried:

i have tried by using except but its returning all cloumns

Posted 12-Jun-16 19:39pm

Veena Hosur

Updated 12-Jun-16 19:54pm

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aarif moh shaikh · Answer 1 · 2016-06-12T19:54:00

Solution 1

Here is two way to resolve your problem .
1. You can use the EXCEPT or INTERSECT set operators for this. for example

SQL

SELECT id, name FROM master.dbo.test
EXCEPT  -- or INTERSECT
SELECT id, name FROM test.dbo.testings

2. Use of Information Schema

SQL

select * 
FROM questions_table 
WHERE questioncolumn IN
(
  select column_name 
  from information_schema.columns where table_name='dynamic_table'
);

Posted 12-Jun-16 19:54pm

aarif moh shaikh

Comments

Veena Hosur 13-Jun-16 3:02am

test.dbo.testings is other table ?

aarif moh shaikh 13-Jun-16 3:14am

yes

Veena Hosur 13-Jun-16 3:23am

tableA

field1 | field2 | field3 |

1 | 2 | 3 |
2 | 8 | 7 |
3 | 66 | 24 |
TableB

field1 | field2 | field3 |

1 | 2 | 3 |
2 | 8 | 7 |
3 | 66 | 57 |
Here i want to return mandatory field field1 and field3 whose value is not matching with other table. Result should be like,

field1 | field3 |

3 | 57 |

Veena Hosur 13-Jun-16 3:23am

it wil return all fields na