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Database management system (DBMS) are designed software application that interact with the user, other application and the database to capture and analyze data. DBMS is used for defining, creating, querying, updating and administration of database. DBMS include MySQL, Microsoft SQL Server, Oracle and many more.

Types of DBMS are as follows:

Data Definition Language-DDL

DDL is used for defining the database structure or schema.


  • CREATE– used to create objects in DB.
  • ALTER– used to alter the structure of DB.
  • DROP– used to delete object from the DB.
  • TRUNCATE– used to remove all records from a table,
    including all spaces allocated for the records are removed
  • COMMENT–used to add comments to the data dictionary
  • RENAME–used to rename an object

Data Manipulation Language (DML)

DML are used for managing data within the schema objects.


  • SELECT – used to retrieve data from DB.
  • INSERT – used to insert data into a table.
  • UPDATE – used to update the existing data in table.
  • DELETE – used to deletes all records from a table, the space for the records remain
  • MERGE – used to UPSERT operation (insert or update)
  • CALL – used to call a PL/SQL or Java subprogram
  • EXPLAIN PLAN – used to explain access path to data
  • LOCK TABLE - control concurrency

Data Control Language (DCL)

Data Control Language (DCL) statements.


  • GRANT - gives user's access privileges to database
  • REVOKE - withdraw access privileges given with the GRANT command

Transaction Control (TCL)

TCL statements are used to manage the changes made by DML statements


  • COMMIT - save work done
  • SAVEPOINT - identify a point in a transaction to which you can later roll back
  • ROLLBACK - restore database to original since the last COMMIT
  • SET TRANSACTION - Change transaction options like isolation level and what rollback segment to use

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