Question

I am getting an “Incorrect syntax near ‘+’ error at the following line:

Select * FROM  + @DATABASE_NAME + '.' + @SCHEMA_NAME + '.' + @TABLE_NAME;

Here is my SQL:

Declare @TABLE_NAME varchar(10)
Declare @SCHEMA_NAME varchar(10)
Declare @DATABASE_NAME varchar(10)

Set @TABLE_NAME = 'Freshmen';
Set @SCHEMA_NAME = 'stu';
Set @DATABASE_NAME = 'Student';

Select * FROM  + @DATABASE_NAME + '.' + @SCHEMA_NAME + '.' + @TABLE_NAME;

Am I missing something here?

Answer 1

You can’t use variables for the database or tables on your FROM. The only way would be to use dynamic sql (but before take a look at this link).

Declare @TABLE_NAME varchar(10)
Declare @SCHEMA_NAME varchar(10)
Declare @DATABASE_NAME varchar(10)
Declare @QUERY VARCHAR(4000)

Set @TABLE_NAME = 'Freshmen';
Set @SCHEMA_NAME = 'stu';
Set @DATABASE_NAME = 'Student';
Set @QUERY = 'Select * FROM ' +  QUOTENAME(@DATABASE_NAME) + '.' + QUOTENAME(@SCHEMA_NAME) + '.' + QUOTENAME(@TABLE_NAME)

EXEC(@QUERY)