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DDL Essentials

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DDL basics

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DDL Essentials
 

DDL EssentialsOnline version

DDL basics

by ASHITHA VIJU
1

DDL statements define or modify the database schema.

2

RENAME can change the name of a table or other schema object.

3

DROP DATABASE removes a database from the system.

4

RENAME changes a column's data type.

5

DDL statements delete only metadata and never affect existing data.

6

ALTER TABLE can add, modify, or drop columns.

7

CREATE TABLE is a typical DDL statement.

8

TRUNCATE is a DDL command that only marks rows as deleted and keeps the same number of rows.

9

You can use DDL to insert new rows into a table.

10

DDL statements are always transactional in all RDBMS.

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