== Why is this an issue?

Referencing a column by specifying the schema or the database is deprecated. It is retained temporarily for backward compatibility, but it will eventually be removed from the language. You should only use one part (``++column_name++``) or two part (``++table_name.column_name++``) references.


=== Noncompliant code example

[source,sql]
----
SELECT dbo.table1.col1,       -- Noncompliant, three-part column reference
       MY_DB.dbo.table1.col2  -- Noncompliant, four-part column reference
       FROM MY_DB.dbo.table1;

SELECT dbo.table1.name,       -- Noncompliant
       dbo.table2.name        -- Noncompliant
       FROM dbo.table1
       JOIN dbo.table2
         ON dbo.table2.id = dbo.table1.id; -- Noncompliant
----


=== Compliant solution

[source,sql]
----
SELECT col1,
       col2
       FROM MY_DB.dbo.table1;

SELECT table1.name,
       table2.name
       FROM dbo.table1
       JOIN dbo.table2
         ON table2.id = table1.id;
----

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Remove database or schema reference.


=== Highlighting

schema


endif::env-github,rspecator-view[]
