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Veena

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Veena

  1. 1. What is Data Definition LanguageCommands of DDLWhat is Data manipulation LanguageCommands of DMLDifference between DDL & DML
  2. 2.  Data Definition Language (DDL) is a vocabulary used to define data structures in SQL Server or  It is a syntax similar to a computer programming language for defining data structures, especially database schemas.
  3. 3.  Data Definition Language (DDL) statements are used to define the database structure or schema. Some examples: CREATE -CREATE TABLE <table name> ALTER -ALTER TABLE <table name> DROP -DROP TABLE <table name>; COMMENT - add comments to the data dictionary RENAME – RENAME TABLE <table name> DELETE:-DELETE FROM <table name>
  4. 4.  A data manipulation language (DML) is a vocabulary used to retrieve and work with data in SQL Server 2012. Use these statements to add, modify, query, or remove data from a SQL Server database. DML statements are used for managing data within tables A popular data manipulation language is that of Structured Query Language (SQL), which is used to retrieve and manipulate data in a relational database
  5. 5.  Data Manipulation Language (DML) statements are used for managing data within schema objects. Some examples: SELECT - retrieve data from the a database INSERT -INSERT INTO <table name> UPDATE -UPDATE <table name> DELETE -DELETE FROM <table name> MERGE - UPSERT operation (insert or update) CALL - call a PL/SQL or Java subprogram
  6. 6. Diference Between DDL & DML Data Definition Language  Data Manipulation (DDL) statements are used to define the database Language (DML) structure or schema statements are used for managing data These commands will within schema object primarily be used by database administrators  DML statements are during the setup and used for managing removal phases of a data within tables database project

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