In this article you will see how to compare column names in two table.
Assume that, you have two tables and you are asked to find out the columns which exists in both table with same name or column that exists in either of table.
Lets create a two sample table as shown below.
Create table dbo.tableA ( Id int, Name varchar(100), Code varchar(5), Address varchar(100), RegDate datetime, AddedBy varchar(50) ) Create table dbo.tableB ( RowId int, Name varchar(100), KeyCode varchar(5), Address varchar(100), RegDate datetime, AddedBy varchar(50) )
You can see, in both table few columns are having same name while few columns are different in both tables.
Lets write a below SQL query to compare column name between these two tables.
SELECT * into #tblA FROM information_schema.columns WHERE table_Schema ='dbo' and table_name = 'TableA' ; SELECT * into #tblB FROM information_schema.columns WHERE table_Schema ='dbo' and table_name = 'TableB' ; SELECT COALESCE(A.Column_Name, B.Column_Name) AS [Column] ,CASE WHEN (A.Column_Name IS NULL and B.Column_Name IS NOT NULL) THEN 'Column - [' + B.Column_Name+ '] exists in Table - ['+ B.TABLE_NAME + '] Only' WHEN (B.Column_Name IS NULL and A.Column_Name IS NOT NULL) THEN 'Column - [' + A.Column_Name+ '] exist in Table - ['+ A.TABLE_NAME + '] Only' WHEN A.Column_Name = B.Column_Name THEN 'Column - [' + A.Column_Name + '] exists in both Table - ['+ A.TABLE_NAME + ' , ' + B.TABLE_NAME + ']' END AS Remarks FROM #tblA A FULL JOIN #tblB B ON A.Column_Name = B.Column_Name; drop table #tblA; drop table #tblB;
Lets execute the query and see the output.
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