I am using SQL Server 2008 R2.
I want to drop the column if it is already exists in the table else not throw any error.
Tried:
ALTER TABLE Emp
DROP COLUMN IF EXISTS Lname;
Error:
Incorrect syntax near the keyword 'IF'.
By searching I came to know that, this option is available from 2016.
What is the alternative in the SQL Server 2008 R2?
IF EXISTS (SELECT 1
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'Emp'
AND COLUMN_NAME = 'Lname'
AND TABLE_SCHEMA='DBO')
BEGIN
ALTER TABLE Emp
DROP COLUMN Lname
END
GO
From the MSDN social documentation, we can try:
IF EXISTS (SELECT 1 FROM sys.objects o
INNER JOIN sys.columns c ON o.object_id = c.object_id
WHERE o.name = 'Emp' AND c.name = 'Lname')
ALTER TABLE dbo.Emp DROP COLUMN Lname;
I followed this way.
IF COL_LENGTH (N'{Your_TableName}', N'{Your_ColumnName}') IS NOT NULL
BEGIN
ALTER TABLE {Your_TableName}
DROP COLUMN {Your_ColumnName};`
END
GO
Related
So far I've been using the format below for creating/updating tables
IF EXISTS (SELECT 1 FROM sysobjects WHERE name = 'table_name' AND type = 'U')
DROP TABLE [dbo].[table_name]
GO
CREATE TABLE [dbo].[table_name]()
GO
But recently I came across a case where two schemas have a table with the same name. How can I check if the table exists in a specific schema? Its only the partSELECT 1 FROM sysobjects WHERE name = 'table_name' AND type = 'U' that needs fixing, I've changed the rest to:
IF EXISTS (SELECT 1 FROM sysobjects WHERE name = 'table_name' AND type = 'U')
DROP TABLE [schema_name].[table_name]
GO
CREATE TABLE [schema_name].[table_name]()
GO
My current server version is 2008R2 so I would prefer answers that also work for that version. I have many other checks is done this way so I don't really want to completely change this pattern.
TRY
IF OBJECT_ID('[schema_name].[table_name]') IS NOT NULL
DROP TABLE [schema_name].[table_name]
GO
You could use the schemas object as well. For example:
IF EXISTS (SELECT 1
FROM sys.tables t
JOIN sys.schemas s ON t.schema_id = s.schema_id
WHERE s.[name] = N'schema_name'
AND t.name = N'table_name'
AND t.type = 'U')
DROP TABLE [schema_name].[table_name];
GO
Use this syntax.
DROP TABLE IF EXISTS [schema_name].[table_name]
In sql server 2012 i'm using
USE myDatabase;
GO
SELECT *
FROM sys.objects
WHERE type = 'U';
Is it possible to do the same in syBase ?
In order to get a list of all tables in the current database, you can filter the sysobjects table by type = ‘U’ e.g.:
select convert(varchar(30),o.name) AS table_name
from sysobjects o
where type = 'U'
order by table_name
Further Reference
Here is an example of getting all table names in MSSQL or SQL Server database:
USE test; //SELECT DATABASE
SELECT table_name FROM information_schema.tables WHERE table_type = 'base table'
or you can use sys.tables to get all table names from selected database as shown in following SQL query
USE test; //SELECT DATABASE
SELECT * FROM sys.tables
That's all on how to find all table names from database in SQL Server.
For SQL Anywhere 16, this query works fine.
select * from sys.SYSTABLE
It gives a list of the table_names along with the information like table id, table page count, etc.
In order to list all the tables and rows count, the following query can be used.
select convert(varchar(30),o.name) AS table_name,
row_count(db_id(), o.id) AS row_count
from sysobjects o
where type = 'U'
order by table_name
In order get a list of tables which has the table name like, use the following query.
Here table_name has to be replaced with your desired name.
select convert(varchar(30),o.name) AS table_name,
row_count(db_id(), o.id) AS row_count
from sysobjects o
where type = 'U' and o.name like '%table_name%'
order by table_name
I want to write a query for MS SQL Server that adds a column into a table. But I don't want any error display, when I run/execute the following query.
I am using this sort of query to add a table ...
IF EXISTS (
SELECT *
FROM sys.objects
WHERE OBJECT_ID = OBJECT_ID(N'[dbo].[Person]')
AND TYPE IN (N'U')
)
But I don't know how to write this query for a column.
You can use a similar construct by using the sys.columns table io sys.objects.
IF NOT EXISTS (
SELECT *
FROM sys.columns
WHERE object_id = OBJECT_ID(N'[dbo].[Person]')
AND name = 'ColumnName'
)
IF COL_LENGTH('table_name', 'column_name') IS NULL
BEGIN
ALTER TABLE table_name
ADD [column_name] INT
END
Another alternative. I prefer this approach because it is less writing but the two accomplish the same thing.
IF COLUMNPROPERTY(OBJECT_ID('dbo.Person'), 'ColumnName', 'ColumnId') IS NULL
BEGIN
ALTER TABLE Person
ADD ColumnName VARCHAR(MAX) NOT NULL
END
I also noticed yours is looking for where table does exist that is obviously just this
if COLUMNPROPERTY( OBJECT_ID('dbo.Person'),'ColumnName','ColumnId') is not null
Here's another variation that worked for me.
IF NOT EXISTS (SELECT 1
FROM INFORMATION_SCHEMA.COLUMNS
WHERE upper(TABLE_NAME) = 'TABLENAME'
AND upper(COLUMN_NAME) = 'COLUMNNAME')
BEGIN
ALTER TABLE [dbo].[Person] ADD Column
END
GO
EDIT:
Note that INFORMATION_SCHEMA views may not always be updated, use SYS.COLUMNS instead:
IF NOT EXISTS (SELECT 1
FROM SYS.COLUMNS....
IF NOT EXISTS (SELECT * FROM syscolumns
WHERE ID=OBJECT_ID('[db].[Employee]') AND NAME='EmpName')
ALTER TABLE [db].[Employee]
ADD [EmpName] VARCHAR(10)
GO
I Hope this would help. More info
When checking for a column in another database, you can simply include the database name:
IF NOT EXISTS (
SELECT *
FROM DatabaseName.sys.columns
WHERE object_id = OBJECT_ID(N'[DatabaseName].[dbo].[TableName]')
AND name = 'ColumnName'
)
IF NOT EXISTS (SELECT 1 FROM SYS.COLUMNS WHERE
OBJECT_ID = OBJECT_ID(N'[dbo].[Person]') AND name = 'DateOfBirth')
BEGIN
ALTER TABLE [dbo].[Person] ADD DateOfBirth DATETIME
END
How do I check if a column exists in SQL Server 2000?
IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='tablename' AND COLUMN_NAME='columname' )
If col_length('table_name','column_name') is null
select 0 as Present
ELSE
select 1 as Present
Present will be 0, is there is no column_name present in table_name , otherwise 1
#CMS: I don't think that 'INFORMATION_SCHEMA.COLUMNS' have information about every table in DB. Because this didn't worked for me. But my answer did worked.
In query analyzer, select the Database that contains the table in which you need to check if the field exists or not and run the query below.
SELECT count(*) AS [Column Exists]
FROM SYSOBJECTS
INNER JOIN SYSCOLUMNS ON SYSOBJECTS.ID = SYSCOLUMNS.ID
WHERE
SYSOBJECTS.NAME = 'myTable'
AND SYSCOLUMNS.NAME = 'Myfield'
This should do nicely:
if COLUMNPROPERTY(object_id('table_name'), 'column_name', 'ColumnId') is null
print 'doesn\'t exist'
else
print 'exists'
I don't know if this script will work in sqlserver 2000, but in 2008 works:
SELECT COLUMNS.*
FROM INFORMATION_SCHEMA.COLUMNS COLUMNS, INFORMATION_SCHEMA.TABLES TABLES
WHERE COLUMNS.TABLE_NAME=TABLES.TABLE_NAME AND UPPER(COLUMNS.COLUMN_NAME)=UPPER('column_name')
What is the best way to get the names of all of the tables in a specific database on SQL Server?
SQL Server 2000, 2005, 2008, 2012, 2014, 2016, 2017 or 2019:
SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'
To show only tables from a particular database
SELECT TABLE_NAME
FROM [<DATABASE_NAME>].INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
Or,
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
AND TABLE_CATALOG='dbName' --(for MySql, use: TABLE_SCHEMA='dbName' )
PS: For SQL Server 2000:
SELECT * FROM sysobjects WHERE xtype='U'
SELECT sobjects.name
FROM sysobjects sobjects
WHERE sobjects.xtype = 'U'
Here is a list of other object types you can search for as well:
AF: Aggregate function (CLR)
C: CHECK constraint
D: Default or DEFAULT constraint
F: FOREIGN KEY constraint
L: Log
FN: Scalar function
FS: Assembly (CLR) scalar-function
FT: Assembly (CLR) table-valued function
IF: In-lined table-function
IT: Internal table
P: Stored procedure
PC: Assembly (CLR) stored-procedure
PK: PRIMARY KEY constraint (type is K)
RF: Replication filter stored procedure
S: System table
SN: Synonym
SQ: Service queue
TA: Assembly (CLR) DML trigger
TF: Table function
TR: SQL DML Trigger
TT: Table type
U: User table
UQ: UNIQUE constraint (type is K)
V: View
X: Extended stored procedure
SELECT * FROM INFORMATION_SCHEMA.TABLES
OR
SELECT * FROM Sys.Tables
USE YourDBName
GO
SELECT *
FROM sys.Tables
GO
OR
USE YourDBName
GO
SELECT * FROM INFORMATION_SCHEMA.TABLES
GO
SELECT * FROM information_schema.tables
where TABLE_TYPE = 'BASE TABLE'
SQL Server 2012
select * from sysobjects where xtype='U'
exec sp_msforeachtable 'print ''?'''
SELECT name
FROM sysobjects
WHERE xtype='U'
ORDER BY name;
(SQL Server 2000 standard; still supported in SQL Server 2005.)
The downside of INFORMATION_SCHEMA.TABLES is that it also includes system tables such as dtproperties and the MSpeer_... tables, with no way to tell them apart from your own tables.
I would recommend using sys.objects (the new version of the deprecated sysobjects view), which does support excluding the system tables:
select *
from sys.objects
where type = 'U' -- User tables
and is_ms_shipped = 0 -- Exclude system tables
SELECT sobjects.name
FROM sysobjects sobjects
WHERE sobjects.xtype = 'U'
Well you can use sys.objects to get all database objects.
GO
select * from sys.objects where type_desc='USER_TABLE' order by name
GO
OR
-- For all tables
select * from INFORMATION_SCHEMA.TABLES
GO
--- For user defined tables
select * from INFORMATION_SCHEMA.TABLES where TABLE_TYPE='BASE TABLE'
GO
--- For Views
select * from INFORMATION_SCHEMA.TABLES where TABLE_TYPE='VIEW'
GO
In SSMS, to get all fully qualified table names in a specific database (E.g., "MyDatabase"):
SELECT [TABLE_CATALOG] + '.' + [TABLE_SCHEMA] + '.' + [TABLE_NAME]
FROM MyDatabase.INFORMATION_SCHEMA.Tables
WHERE [TABLE_TYPE] = 'BASE TABLE' and [TABLE_NAME] <> 'sysdiagrams'
ORDER BY [TABLE_SCHEMA], [TABLE_NAME]
Results:
MyDatabase.dbo.MyTable1
MyDatabase.dbo.MyTable2
MyDatabase.MySchema.MyTable3
MyDatabase.MySchema.MyTable4
etc.
Any of the T-SQL code below will work in SQL Server 2019:
-- here, you need to prefix the database name in INFORMATION_SCHEMA.TABLES
SELECT TABLE_NAME FROM [MSSQL-TEST].INFORMATION_SCHEMA.TABLES;
-- The next 2 ways will require you to point
-- to the specific database you want to list the tables
USE [MSSQL-TEST];
-- (1) Using sys.tables
SELECT * FROM sys.tables;
-- (2) Using sysobjects
SELECT * FROM sysobjects
WHERE type='U';
Here’s a working example using [Skyvia] using sys.tables.
[Skyvia] should be the link to https://skyvia.com/connectors/sql-server
[1]: https://i.stack.imgur.com/o3qo9.png
Your SQL GUI tool should also have a way to list down all the tables in a database like the one above.
So, whatever suits your need and taste, there’s a code or GUI tool for that.
--for oracle
select tablespace_name, table_name from all_tables;
This link can provide much more information on this
topic
Please use this. You will get table names along with schema names:
SELECT SYSSCHEMA.NAME, SYSTABLE.NAME
FROM SYS.tables SYSTABLE
INNER JOIN SYS.SCHEMAS SYSSCHEMA
ON SYSTABLE.SCHEMA_ID = SYSSCHEMA.SCHEMA_ID
UPDATE 2022:
You can list/show the tables that you created with this simple query in Microsoft SQL SERVER.
select * from SYS.TABLES;
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE='BASE TABLE'
ORDER BY TABLE_NAME
Thanks to Ray Vega, whose response gives all user tables in a database...
exec sp_msforeachtable 'print ''?'''
sp_helptext shows the underlying query, which summarises to...
select * from dbo.sysobjects o
join sys.all_objects syso on o.id = syso.object_id
where OBJECTPROPERTY(o.id, 'IsUserTable') = 1
and o.category & 2 = 0
Using SELECT * FROM INFORMATION_SCHEMA.COLUMNS also shows you all tables and related columns.
To remove tables added by replication and any other table Microsoft adds run this:
SELECT s.NAME SchemaName, t.NAME TableName
FROM [dbname].SYS.tables t
INNER JOIN [dbname].SYS.SCHEMAS s
ON t.SCHEMA_ID = s.SCHEMA_ID
WHERE t.is_ms_shipped=0 and type_desc = 'USER_TABLE'
ORDER BY s.NAME, t.NAME