TSQL - Find a column in the database

If you need to find where a certain column is used in the database you can use the following sql code.

select *
from INFORMATION_SCHEMA.columns
where column_name = 'CustomerStatus'

TSQL - Update using an inner join

Sometimes you want to update a table and require a join with another table. The achieve this use the following construction.

UPDATE t1
SET t1.CalculatedColumn = t2.[Calculated Column]
FROM dbo.Table1 AS t1
INNER JOIN dbo.Table2 AS t2 ON t1.CommonField = t2.[Common Field]
WHERE t1.BatchNo = '110';

Add a column to an existing table


 if not exists (select 1 from INFORMATION_SCHEMA.columns
 where table_schema = 'dat'
   and table_name = 'table_name'
   and column_name = 'your_column')   
 begin
     alter table dat.table_name
     add your_column varchar(255)
 end

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