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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Copy Table With Data From One Database to Another in SQL Server 2012
This article demonstrates how to copy a table with data from one database to another in a SQL Server database. In this article, we use a source database containing a table with data and create another database which contains the copy of the table with data from the source database. So let’s take a look at a practical example of how to copy a table with data from one database to another in SQL Server. The example is developed in SQL Server 2012 using the SQL Server Management Studio. There are some simple methods to do that are described here.
Creating a table in SQL Server
Now we create a table named employee using:
CREATETABLE [dbo].[Employee]
(
[EmpID] [int] NULL,
[EmpName] [varchar](30) NULL,
[EmpSalary] [int] NULL
)
The following is the sample data for the employee table:
Method 1: Copy Table using SELECT INTO
This command only copies a table’s schema and its data. The Select into is used to copy a table with data from one database to another database’s table. The Select into is also used to create a new table in another database. The general syntax to do that is:
Syntax
SELECT * INTO DestinationDB.dbo.tableName FROM SourceDB.dbo.SourceTable
Example
The employee table is defined in the master database. It is also called the source database. Now you want to copy the table with data from the master database to the model database. The following query defines it:
SELECT * INTO Model.dbo.[Employee] FROM Master.dbo.[Employee]
Now hit F5 to execute it.
Now press F8 to open the Object Explorer and select the model database to see the employee table.
Method 2: Generating Script in SQL Server
If you want to copy all objects, indexes, triggers, constraints etc then do it using “Generate Scripts…”. Suppose we have a database named Test. Now right-click on the Test database and select the “Generate Scripts…”option.
database Name -> “Tasks” -> “Generate Scripts….”
Now click on “Generate Scripts…”. The Generate Scripts wizard will be opened.
Now click on the “Next” Button and select tables and Stored Procedures.
Now click on the “Next” Button and provide the proper name with path of the file.
Now click on the “Next” Button and review your source and target location.
Now click on the “Next” Button.
Now finally click on the “Finish” button.
The script file has been generated for the Test database. To see the generated script file, select the location of the file in your computer.
Creating a Database in SQL Server
These are the following steps to create a new database:
Press F8 to open the Object Browser in SQL Server Management Studio and expend it
Database -> right-click-> select New database
This would open the “New database” window
Now enter a database name to create a database
Now click on the OK button to create the database. The new database will be shown in the Object Explorer
Now the database, named DatabaseTest, has been created.
Copy Database Schema and Data to Other Database
Now right-click on the script file and open it in Notepad and copy all the data and paste it in the query window in SQL Server. It will look as in the following:
Now only change the database name test to DatabaseTest.
Now press F5 to execute the script and expand the databaseTest to see the schema and data.