1. Data Definition Language ( DDL )
Is a SQL command for data definition :
· CREATE to create the database , table or index
· ALTER to change the table structure
· DROP to delete the database , table or index
Languange 2. Data Manipulation ( DML )
- Language to access the database
- Language to process database
- Language to call functions aggregation
- Language to query
- The types of queries :
· Simple
· Join
· Multi-storey ( Nested Queries )
Source : http://harisahmad.blogspot.com
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