Lesson06 Data Definition Commands.pptx

Lesson06 Data Definition Commands.pptx - Data Definition...

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Data Definition Commands DBMS Course
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Topic & Structure Lesson SQL Data Types Integrity Constraints DDL Statements Creating Tables 2
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SQL Data Types SQL data type specifies type of data of any object. Each column, variable and expression has related data type in SQL. You would use SQL data types while creating your tables. You would choose a particular data type for a table column based on your requirement. 3
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ISO SQL Data Types 4
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MS SQL Server Data Types Category Data types Numeric Integer int, bigint, smallint, tinyint Exact decimal, numeric Approxima te float, real Monetary money, smallmoney Date and time datetime, smalldatetime Charact er Non- Unicode char, varchar, varchar(max), text Unicode nchar, nvarchar, nvarchar(max), ntext Binary binary, varbinary, varbinary(max) Image image Global identifier uniqueidentifier XML xml 5
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SQL Constraints SQL constraints are used to specify rules for the data in a table. If there is any violation between the constraint and the data action, the action is aborted by the constraint. Constraints can be specified when the table is created (inside the CREATE TABLE statement) or after the table is created (inside the ALTER TABLE statement). 6
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SQL Constraints Types Not Null Unique Primary key Default Check constraint Referential Integrity constraint 7
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