INFORMATION_SCHEMA.TABLES or INFORMATION_SCHEMA.COLUMNS work for only specified databases.
Is it possible to query table metadata for ALL databases on server by using INFORMATION_SCHEMA?
You can do this only by using dynamic query for database iteration. One way is using ms_ForEachDB stored procedure, second is querying sys.databases dynamic view.
Expanding Dalex's answer into code.
--Make sure you have a global temporary table to use. Double dots are shorthand for .dbo.
IF OBJECT_ID('tempdb..##test') IS NOT NULL DROP TABLE ##test
--Create the table definition the easy way.
SELECT * INTO ##test
FROM ???.INFORMATION_SCHEMA.TABLES --The ??? will be whatever the name of your first database is.
DELETE FROM ##test
--Add all the data.
EXEC sp_MSforeachdb 'USE ? INSERT INTO ##test SELECT * FROM INFORMATION_SCHEMA.TABLES'
--View all the data.
SELECT * FROM ##test
--Clean up.
DROP TABLE ##test
Modified Dustin's code (from Dalex's suggestion) to accommodate database names with spaces and eliminate common system tables from results.
--Make sure you have a global temporary table to use. Double dots are shorthand for .dbo.
IF OBJECT_ID('tempdb..##test') IS NOT NULL DROP TABLE ##test
--Create the table definition the easy way.
SELECT top 1 * INTO ##test
FROM INFORMATION_SCHEMA.TABLES
DELETE FROM ##test
--Add all the data.
EXEC sp_MSforeachdb 'USE [?] INSERT INTO ##test SELECT * FROM INFORMATION_SCHEMA.TABLES'
--View all the data.
SELECT * FROM ##test
WHERE TABLE_CATALOG NOT IN ('master','tempdb', 'msdb')
ORDER BY TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME
--Clean up.
DROP TABLE ##test
You can use this:
SELECT TABLE_SCHEMA
FROM information_schema.tables
group by tables.TABLE_SCHEMA
This isn't the answer to the question but this text adds context ... and text is likely to be useful to someone to gain understanding.
It is possible and often required to add a use clause to select which database is being referenced above the select clause ..
e.g.
use CaseData
SELECT *
FROM information_schema.columns
--WHERE
--TABLE_CATALOG = 'CaseData'
--and TABLE_SCHEMA ='Clinical'
--and
--TABLE_NAME = 'SAASCaseData_NewFieldsOct2018'
SELECT DISTINCT `TABLE_SCHEMA` FROM `information_schema`.`TABLES`;
Related
I have 2 tables corporate and corporate_copy. Initially they were same in structure but people started added new columns into corporate and forgot do do so for corporate_copy.
Somewhere in the application there is less used functionality that copies data from corporate to corporate_copy and that kept failing without anyone noticing. Now I have to add 28 columns (ofcourse with same type and length and constraints etc....).
I know it can be done in one ALTER TABLE statement but I still feel it is lengthy task.
Do we have any luxury that will make copy table same as main table by keeping data and adding default values in newly added columns?
I am asking much but is there anything like that?
--Generate a dynamic query which contain all the missing column list and Execute it
--for eg I tried Something
BEGIN TRAN
DECLARE #SqlSelect NVARCHAR(MAX),#ColumnDeclaration VARCHAR(2000)
SELECT DISTINCT ' '+COLUMN_NAME+' '+ DATA_TYPE +' '+ISNULL(CONVERT(NVARCHAR(10), CHARACTER_MAXIMUM_LENGTH ),'')+' 'Missing_Column INTO #T FROM INFORMATION_SCHEMA.COLUMNS a
WHERE a.column_name not in (SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS b
WHERE b.table_name in ('Corporate_Copy'))
and a.table_name in ('Corporate')
SELECT #ColumnDeclaration=STUFF((
SELECT ', ' + Missing_Column
FROM #T
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(max)'), 1, 1, '')
SET #SqlSelect=' ALTER TABLE Corporate_Copy Add'+ #ColumnDeclaration + ');'
PRINT #SqlSelect
ROLLBACK TRAN
You could use schema compare, found in SQL Server data tools (free) to generate a change script automatically.
But if this is just a copy, you could just run this:
DROP TABLE Corporate_Copy;
SELECT *
INTO Corporate_Copy
FROM Corporate;
It's not clear whether you really need to preserve the data in the copy. If so, it's not really a copy is it?
From SQL-Server 2015, you can use the following query to extract all different columns between 2 tables:
select distinct a.* from INFORMATION_SCHEMA.COLUMNS a
where a.column_name not in (select column_name from INFORMATION_SCHEMA.COLUMNS b
where b.table_name in ('tbl_A'))
and a.table_name in ('tbl_B')
order by a.column_name
The output gives you enough information to create a simple script to add the columns which are missing:
For exmaple:
Alter table tbl_A ADD res.Column_Name res.Data_Type ....
generate CREATE script in SSMS (right-click on table, then "script table as...")
Delete all things that already exists. Usually they are in the begining and it's a simple
change CREATE to ALTER ... ADD
That should be possible using SELECT INTO, for example the following SQL statement creates a backup copy of corporate:
SELECT * INTO corporate_copy
FROM corporate ;
How to select all columns from the table besides two or three?
I work with a lot of tables with more than 50 columns, so I can not list of column name...
I hope that it works, but it doesn't
SELECT(
SELECT column_name FROM all_tab_columns
WHERE table_name = <table_name>
AND column_name NOT IT (<columns_name>)
)
from <table_name>;
Could you help me please?
You can construct the query dynamically through a pl/sql procedure and then run it using "execute immediate"
I found some workaround (because PL/SQL to hard for simple select):
CREAT TABLE <tmp> AS SELECT * FROM <table_name>;
ALTER TALBE <tmp> DROP COLUMN <column_name>;
SELECT * FROM <tmp>;
DROP TALBE <tmp>;
It will be useful to simple query...
But for development PL/SQL will be more useful (universally, optimized for server, etc).
I am running a SELECT INTO statement like this so I can manipulate the data before finally dropping the table.
SELECT colA, colB, colC INTO #preop FROM tblRANDOM
However when I run the statement and then, without dropping the newly created table, I then run either of the following statements, the table isn't found? Even scanning through object explorer I can't see it. Where should I be looking?
SELECT [name] FROM sysobjects WHERE [name] = N'#preop'
SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '#preop'
Temp tables aren't stored in the local database, they're stored in tempdb. Also their name isn't what you named them; it has a hex code suffix and a bunch of underscores to disambiguate between sessions. And you should use sys.objects or sys.tables, not the deprecated sysobjects (note the big warning at the top) or the incomplete and stale INFORMATION_SCHEMA views.
SELECT name FROM tempdb.sys.objects WHERE name LIKE N'#preop[_]%';
If you are trying to determine if such an object exists in your session, so that you know if you should drop it first, you should do:
IF OBJECT_ID('tempdb.dbo.#preop') IS NOT NULL
BEGIN
DROP TABLE #preop;
END
In modern versions (SQL Server 2016+), this is even easier:
DROP TABLE IF EXISTS #preop;
However if this code is in a stored procedure then there really isn't any need to do that... the table should be dropped automatically when the stored procedure goes out of scope.
I'd prefer to query tempdb in such manner:
IF EXISTS (SELECT * FROM tempdb.sys.objects
WHERE object_id = OBJECT_ID(N'tempdb.[dbo].[#MyProcedure]')
AND type in (N'P', N'PC'))
BEGIN
print 'dropping [dbo].[#MyProcedure]'
DROP PROCEDURE [dbo].[#MyProcedure]
END
GO
Below is how I got the columns for a temporary table:
CREATE TABLE #T (PK INT IDENTITY(1,1), APP_KEY INT PRIMARY KEY)
SELECT * FROM tempdb.INFORMATION_SCHEMA.COLUMNS c WHERE c.TABLE_NAME LIKE '#T%'
This is my first time posting on SO, so please go easy!
I'm attempting to write a SQL script that queries the same table for a list of databases in a single SQL Server instance.
I have successfully queried the list of databases that I required using the following, and inserting this data into a temp table.
Select name Into #Versions
From sys.databases
Where name Like 'Master%'
Master is suffixed with numerical values to identify different environments.
Select * From #Versions
Drop Table #Versions
The table name I am trying to query, is the same in each of the databases, and I want to extract the newest value from this table and insert it into the temp table for each of the database names returned.
I have tried researching this but to no avail. I am fairly comfy with SQL but I fear I could be out of my depth here.
You can do the following. Once you have the list of your databases, you can build up the query (you need to edit it for your purpose).
Select name Into #Versions
From sys.databases
Where name Like 'test%'
declare #sql as varchar(max) = ''
select #sql = #sql + 'INSERT INTO sometable SELECT TOP 1 * FROM ' + name + '..sourcetable ORDER BY somedate DESC; '
FROM #Versions
exec (#sql)
Drop Table #Versions
Look at The undocumented sp_MSforeachdb procedure and here
I'm debating whether or not to try running through a list of tables and truncating them with a stored procedure. Would it be that easy with MySql and how would I do it?
The main piece of info you need is the list of tables. Most platforms support this:
select table_name from information_schema.tables
However, before you code the sproc, do a select * from information_schema.tables and examine the entries, there may be some you do not expect -- system tables and such, so you may need to craft a filter to get the set you want.
Since I don't do mySQL that much, I can't show you the code, but if you can translate this from MS SQL, and fill in some blanks you can make it work:
declare #table_name varchar(200)
while 1=1 begin
select top 1 #table_name = table_name
from information_schema.tables
where ....possible filter...
if #table_name is null break
-- for this line you may need dynamic sql
truncate table #table_name
end