An Introduction To T SQL Server
Posted By : Annu Sehrawat | 27-Aug-2020
A database is an organized collection of data. It is the gathering of schemes, tables, queries, reports, views, and other objects.
A relational database consists of a set of tables that stores particular Sets of data.
Creating a database
Create a new Database and therefore the file used to store the database.
database_name:- database_name is often a maximum of 128 characters. Unless a logical name isn’t specified for the log file. If a logical log file name isn’t specified, SQL Server generates the logical_file_name and therefore the os_file_name for the log by appending a suffix to database_name. This limits database_name to 123 characters in order that the generated logical file name is not any quite 128 characters.
Creating a database that specifies data and transaction log files.
Remove one or more user Databases from an Instance of SQL Server.
database_name:- Specifies the name of the database to be removed. To display an inventory of databases, use the sys.databases catalog view.
Dropping multiple databases:
Modifies a database, or the files and filegroups related to the database. Adds or removes filegroups from a database and modifies the elements of a database or its files and filegroups, changes the database collation, and sets database options.
OldDatabase_Name:- Is that the name of the database to be modified?
MODIFY NAME:- Renames the database with the name specified as New Database_Name.
Data Definition Language (DDL)
Data Definition Language (DDL) is a vocabulary wont to define data structures in SQL Server. Use the following statements to create, alter, or drop data structures in an instance of SQL Server.
Create command is additionally used to create a table. We can define names and data types of various columns along.
Rename command is employed to rename a table.
- To add a column to an existing table.
- To modify an existing column.
- To rename the column.
- Alter is additionally used to drop a column.
The Drop query completely removes a table from databases.
The Truncate command removes all records from a table. But this command will not demolish the table's structure
Data Manipulation Language (DML)
Data Manipulation Language (DML) is a vocabulary wont to retrieve and work with data in SQL Server. Use the following statements to add, modify, query, or remove data from a SQL Server database.
Insert command is employed to insert data into a table.
Example: A table student with the following fields.
Insert a record into the student table.
The Update command is employed to update a row of a table.
Delete command is used to delete the data from a table. Delete command can also be used with the condition to delete a specific row.
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