SQL Server, how to merge two columns into one column?

Question

I have a SQL query

SELECT TABLE_SCHEMA + TABLE_NAME AS ColumnZ 
FROM information_schema.tables

I want the result should be table_Schema.table_name.

help me please!!

Positively

Use SELECT TABLE_SCHEMA + '.' + TABLE_NAME .... – Platitudinize

Answer 1

Try this:

SELECT TABLE_SCHEMA + '.' + TABLE_NAME AS ColumnZ 
FROM information_schema.tables

Larimer

Thanks. Very simple '+' oprator compbine coumn in to single column – Nevski

Answer 2

This code work for you try this....

SELECT Title,
FirstName,
lastName, 
ISNULL(Title,'') + ' ' + ISNULL(FirstName,'') + ' ' + ISNULL(LastName,'') as FullName 
FROM Customer

Distress

Answer 3

SELECT CONCAT(TABLE_SCHEMA, '.', TABLE_NAME) AS ColumnZ FROM information_schema.tables

Palmer

Watch out: CONCAT is a new feature in SQL Server 2012 and thus might not be available to the person asking – Platitudinize

@Platitudinize I did not know this, it will be useful if I ever have to work with old MSSQL versions, thanks. – Palmer

Being a new feature doesn't make the answer worthy of a downvote, in my opinion. – Cogswell

@GordonLinoff: just to be absolutely clear - it wasn't my downvote; I agree with you - it's a new feature, but it's correct - for that newer version of SQL Server. No downvote warranted ... – Platitudinize

Answer 4

From SQL Server 2017 onwards, there is CONCAT_WS operator, to concatenate with separators.

SELECT CONCAT_WS('.', TABLE_SCHEMA ,TABLE_NAME) AS ColumnZ 
FROM information_schema.tables

Candescent

This is great for handling nulls, where you don't want the extra separators, and can do the same for empty strings in a column if it is wrapped in NULLIF(). – Asclepiadean