How do I get data from sys.schemas, sys.tables, SYS.COLUMNS join with information schemas columns

Question

1.00/5 (1 vote)

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I need full data information of Sys.Schemas,Sys.Tables,Sys.Columns with joining Information_Schema_columns

What I have tried:

select d.name as Schema_Name ,db_name()as Database_Name ,
b.name as Table_Name,c.name as Column_Name ,
isc.ORDINAL_POSITION,isc.COLUMN_DEFAULT,isc.DATA_TYPE, isc.CHARACTER_MAXIMUM_LENGTH,
isc.NUMERIC_PRECISION, isc.NUMERIC_PRECISION_RADIX, isc.NUMERIC_SCALE,isc.DATETIME_PRECISION
from
sys.schemas as d
inner join
sys.tables as b
on d.schema_id=b.schema_id
inner join
sys.columns as c
on c.object_id=b.object_id
inner join INFORMATION_SCHEMA.COLUMNS isc on
isc.TABLE_NAME = OBJECT_NAME(c.object_id) and isc.COLUMN_NAME = c.name and isc.DATA_TYPE <> 'bit'
and isc.COLUMN_NAME like '%email%'
order by Database_Name,Schema_Name,Table_Name,Column_Name

Posted 26-Apr-21 9:32am

Dinesh Bhati 2021

Updated 27-Apr-21 6:03am

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Comments

Wendelius 26-Apr-21 15:53pm

What is the problem you're having?

Dinesh Bhati 2021 27-Apr-21 1:16am

I dont have any problem. I want to Optimize it. So that i can get better results and query exwcutes fatser

RedDk 27-Apr-21 12:19pm

Weel, then to optimize I'd start by running a query and posting some output showing ME the output for this [Column Details].

RedDk 26-Apr-21 17:23pm

Just to confirm, try commenting out "and isc.COLUMN_NAME like '%email%'" (line 15) to see that you can return something. Hopefully you'll see a big table full of information about the instance you're running it on.

If there's no such COLUMN_NAME where the word "email" is surreptitiously contained, leaving that line in will return no records.

Dinesh Bhati 2021 27-Apr-21 1:08am

Actually I need Column Details which have Email information

2 solutions

Solution 1

If I remember correctly I did something like that in a converter project, see: Convert SQL Server Database to PostgreSQL[^]
It is rather old though and was written for SQL Server 2008.

Posted 26-Apr-21 22:35pm

RickZeeland

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Wendelius · Accepted Answer · 2021-04-27T06:03:00

So if the question is about optimizing, there's mot too much you can do since these are system views you're querying.

However, from performance point of view but also to achieve simple query structure it would be best to stick solely with INFORMATION_SCHEMA views and to use all joining columns. Have a try with the following example. It should perform quite well.

SQL

SELECT s.CATALOG_NAME      AS Database_Name,
       s.SCHEMA_NAME       AS Schema_Name,
       st.TABLE_NAME       AS Table_Name,
	   sc.COLUMN_NAME      AS Column_Name,
       sc.ORDINAL_POSITION,
	   sc.COLUMN_DEFAULT,
	   sc.DATA_TYPE,
	   sc.CHARACTER_MAXIMUM_LENGTH,
       sc.NUMERIC_PRECISION, 
	   sc.NUMERIC_PRECISION_RADIX, 
	   sc.NUMERIC_SCALE,
	   sc.DATETIME_PRECISION
FROM       INFORMATION_SCHEMA.SCHEMATA s
INNER JOIN INFORMATION_SCHEMA.TABLES   st ON  st.TABLE_SCHEMA  = s.SCHEMA_NAME
                                          AND st.TABLE_CATALOG = s.CATALOG_NAME
INNER JOIN INFORMATION_SCHEMA.COLUMNS  sc ON  sc.TABLE_SCHEMA  = st.TABLE_SCHEMA
                                          AND sc.TABLE_NAME    = st.TABLE_NAME
										  AND sc.TABLE_CATALOG = st.TABLE_CATALOG
WHERE sc.DATA_TYPE   <> 'bit'
AND   LOWER(sc.COLUMN_NAME) LIKE '%email%'
ORDER BY s.CATALOG_NAME,
         s.SCHEMA_NAME,
         st.TABLE_NAME,
	     sc.COLUMN_NAME;