SQL stands for Structured Query Language. A query language is a kind of programming language that's designed to facilitate retrieving specific information from databases, and that's exactly what SQL does.
An operator is a reserved word or a character used primarily in an SQL statement's WHERE clause to perform operation(s), such as comparisons and arithmetic operations.
SQL commands are the instructions used to communicate with a database to perform tasks, functions, and queries with data. SQL commands can be used to search the database and to do other functions like creating tables, adding data to tables, modifying data, and dropping tables
MySQL queries are SQL functions that help us to access a particular set of records from a database table. We can request any information or data from the database using the clauses or let’s say SQL statements.
A query is a question or inquiry to a set of data. We use SQL, or Structured Query Language, to retrieve data from databases. When we build the structure we are pulling data from tables and fields. The fields are columns in the database table while the actual data makes up the rows.
An SQL key is either a single column (or attribute) or a group of columns that can uniquely identify rows (or tuples) in a table. SQL keys ensure that there are no rows with duplicate information.
Joins in SQL can be of four different types, subjected to the outcome expected by combining records from two or more tables by making use of the common columns from tables involved in the Join function. Inner Join is used to get records with same values In both tables, Left Join is used to get all records from Left side table and only matching values from right table and Right Join is used to get all records from Right table and only matching records in left table. finally Full Join to get all the records from both tables irrespective of matching records.
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Creating Duplicate Table With New Name From Existing Table in SQL Server 2012
In this article, you will see how to create a duplicate table with a new name using a script in SQL Server. Suppose you have a table with 40 fields and you want to create a table with the same structure but a new name. If you create a new empty table then it will take extra time to define all the fields again. So instead we create a script of the table and replace the table name with the new name from the table script which creates a new table with the same column names, data types, and nullable settings. So let’s take a look at a practical example of how to create a script in SQL Server. The example is developed in SQL Server 2012 using the SQL Server Management Studio.
Creating the Table in SQL Server
CREATETABLE [dbo].[UserDetail]
(
[User_Id] [int] NOTNULL,
[FirstName] [varchar](255) NULL,
[LastName] [varchar](255) NOTNULL,
[Address] [varchar](255) NULL
)
Now insert data into the table. The table will look as in the following:
Creating Table Script in SQL Server Management Studio
Now Press F8 to open the Object Browser in SQL Server Management Studio and expand it.
Database -> Table then right-click then select Script Table as -> Create to -> New Query Editor Window.
USE [master]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATETABLE [dbo].[UserDetail](
[User_Id] [int] NOTNULL,
[FirstName] [varchar](255) NULL,
[LastName] [varchar](255) NOTNULL,
[Address] [varchar](255) NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
The above script generates a script for the UserDetail table in a new query window.
Now change the name of the table in the script to whatever you want the new table to be named.
USE [master]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATETABLE [dbo].[UserDetailRecreate] — Changing the name of the above table
(
[User_Id] [int] NOTNULL,
[FirstName] [varchar](255) NULL,
[LastName] [varchar](255) NOTNULL,
[Address] [varchar](255) NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
Now Execute the script. Press F5
Now refresh the Master database and expand it to see the new table in the Object Explorer.
Create a Duplicate Table with New Name from Existing table programmatically
SELECT *
INTO [UserDetailRecreate]
FROM [UserDetail]
WHERE 1 = 2
Here, 1=2 will prevent the data from being copied from UserDetailto the UserDetailRecreate table.