Difference between revisions of "SQL Constraints"

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=CONSTRAINTS=
 
 
 
==Class==
 
SQL Applications
 
 
 
 
==Purpose==
 
==Purpose==
 
To define rules that help to provide data integrity
 
To define rules that help to provide data integrity
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{| class="wikitable"
+
{| class="wikitable" width="100%"
 
|[[CHECK Table Constraint|CHECK]]||[[ERROR Table Constraint|ERROR]]||[[FOREIGN KEY Table Constraint|FOREIGN KEY]]
 
|[[CHECK Table Constraint|CHECK]]||[[ERROR Table Constraint|ERROR]]||[[FOREIGN KEY Table Constraint|FOREIGN KEY]]
 
|-
 
|-
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{| class="wikitable"
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{| class="wikitable" width="100%"
 
|[[AUTO_INCREMENT Column Constraint|AUTO_INCREMENT]]||[[AUTOINC Column Constraint|AUTOINC]]||[[CALCULATED Column Constraint|CALCULATED]]
 
|[[AUTO_INCREMENT Column Constraint|AUTO_INCREMENT]]||[[AUTOINC Column Constraint|AUTOINC]]||[[CALCULATED Column Constraint|CALCULATED]]
 
|-
 
|-
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==Products==
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Recital Database Server, Recital Mirage Server, Recital Terminal Developer
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[[Category:Documentation]]
 
[[Category:Documentation]]
 
[[Category:SQL|Constraints]]
 
[[Category:SQL|Constraints]]
 
[[Category:Reference]]
 
[[Category:Reference]]

Latest revision as of 10:22, 6 March 2015

Purpose

To define rules that help to provide data integrity


See Also

ALTER TABLE, CREATE TABLE, GRANT, REVOKE


Description

A constraint is used to define rules that help to provide data integrity. There are two different types of constraints, TABLE constraints, which do not require any column information and column constraints, which are specific to the column name specified. You must have ALTER privilege on the table. The table will be locked for EXCLUSIVE use during the operation.

Table Constraints

CHECK ERROR FOREIGN KEY
INDEX KEY ONCLOSE
ONDELETE ONINSERT ONOPEN
ONROLLBACK ONUPDATE PRIMARY KEY
UNIQUE


Column Constraints

AUTO_INCREMENT AUTOINC CALCULATED
CHECK DEFAULT DESCRIPTION
ERROR FOREIGN KEY NOCPTRANS
NOT NULL NULL PRIMARY KEY
RANGE RECALCULATE REFERENCES
SET CHECK UNIQUE