从T-SQL查询中获取所有表名和列名的方法

Question

I have very large query (here are used more than 100 tables and thousands of columns), and I need to get list of all columns and tables used in this query. Maybe there is any already created software or script to achieve that?

For example:

Query:

SELECT t1.Col1, t1.Col2, t1.Col3, t2.Col4, t2.Coln
FROM TableName1 t1
JOIN TableName2 t2 ON t1.Col1 = t2.Col4

Output should be:

TableName1
Col1
Col2
Col3

TableName2
Col4
Coln

Answer 1

I agree with the comments asking why you need such information and why a query would need to query so many tables. That aside, this is still solvable.

Some low-tech ways would be:

1. If all tables referenced in the query are schema-qualified (like dbo.table_name ), which they should be for best performance, search for your schema in a text editor, or write a small shell script to parse the query text for dbo .
2. Extract the execution plan of the query and extract a list of objects from it using XML.

But this is what I would do. This is probably the simplest and most reliable. Put the query into a stored procedure, install the procedure, and check its dependencies.

In SQL Server Management Studio, if you right-click a stored procedure, there is a 'View Dependencies' menu item which will show you which tables it relies on. If you need a more programmatic answer, you can extract the dependencies from DMV's (sys.dm_*).

select re.referenced_schema_name + '.' + re.referenced_entity_name as table_name
from sys.dm_sql_referenced_entities('PROC_NAME', 'OBJECT') re
where re.referenced_minor_id = 0;

This also returns a row for any functions the query calls. If needed, I'm sure you can filter those out by joining to a DMV that breaks down object types.