Create database if db does not exist - sql

Question

I want to make SQL Server script for creating database if it does not exist.
IF NOT EXISTS(SELECT * FROM sys.databases WHERE name = 'DataBase')
BEGIN
CREATE DATABASE DataBase
USE DataBase
CREATE TABLE TableName (
Id INT PRIMARY KEY IDENTITY (1, 1),
Name VARCHAR(100)
)
--more tables here
--some procedures here too
END
From code above I'm getting this error:
Msg 911, Level 16, State 1, Line 5
Database 'DataBase' does not exist. Make sure that the name is entered correctly.
How to make database with tables and procedures when database does not exist? I want to make it in one query.

Answer 1

Could you check the following script :
IF NOT EXISTS(SELECT * FROM sys.databases WHERE name = 'DataBase')
BEGIN
CREATE DATABASE [DataBase]
END
GO
USE [DataBase]
GO
--You need to check if the table exists
IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='TableName' and xtype='U')
BEGIN
CREATE TABLE TableName (
Id INT PRIMARY KEY IDENTITY (1, 1),
Name VARCHAR(100)
)
END

Answer 2

Obviously you have to start with (and mind the GO here):
USE master
GO
But you have to do it like this:
IF NOT EXISTS (SELECT * FROM sys.databases WHERE name = 'MyTestDataBase')
BEGIN
CREATE DATABASE MyTestDataBase;
END;
GO
Mind the GO again. If you don't use GO SSMS (or any other client) will still think your batch is not completed, your database is still not created and therefore not available for further use, and you get the error message you posted.
Now you can start using your just created database with:
USE MyTestDataBase;
GO
Again, mind the GO statement. In this case it is inadmissible because it is not possible to combine CREATE DATABASE and CREATE TABLE statements in one batch. So after the GO continue with:
IF OBJECT_ID('MyTestTable', 'U') IS NULL
BEGIN
CREATE TABLE dbo.MyTestTable
(
Id INT PRIMARY KEY IDENTITY(1, 1)
, Name VARCHAR(100)
);
END;
As already mentioned by others it is good practice to check if every table exists and do a create action if it doesn't and alter action if it does (or just do nothing). But if you really don't want to check if each table exists, for instance when you are sure you need to start from scratch, you could start with dropping the database if it exists:
IF EXISTS (SELECT * FROM sys.databases WHERE name = 'MyTestDataBase')
BEGIN
DROP DATABASE MyTestDataBase;
END;
CREATE DATABASE MyTestDataBase;
GO

Answer 3

You can try this.
IF NOT EXISTS (
SELECT *
FROM sys.databases
WHERE name = 'DataBase'
)
BEGIN
CREATE DATABASE [DataBase]
END
GO
USE [DataBase]
GO
IF NOT EXISTS (
SELECT 1
FROM sys.tables
WHERE name = 'TableName'
AND type = 'U'
)
BEGIN
CREATE TABLE TableName (
Id INT PRIMARY KEY IDENTITY(1, 1)
,Name VARCHAR(100)
)
END