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ON DELETE CASCADE OPTION

As mentioned earlier, after a foreign key is defined, Oracle will NOT allow any parent row to be deleted if it has dependent rows in the c...
DELETING ROWS USING DELETE COMMAND

DELETE command is used to delete rows from a table. The following is the syntax of DELETE command. DELETE FROM table [WHERE condition;] ...
HOW TO ENTER SQL AND SQL*PLUS STATEMENTS?

How to enter SQL statements? : SQL*PLUS allow to types of command to entered at the prompt - SQL and SQL*PLUS. SQL commands include com...
CREATING SAMPLE TABLES 2

Batches table : Contains information about all the batches. These batches include batches that were completed, that are currently runnin...
TRANSACTION COMMAND

COMMIT Command : Used to commit all changes made since the beginning of the transaction. It does the following. Makes all the chang...
CREATING INTEGRITY CONSTRAINTS

In the following few sections we will see how to integrity constraints. NOT NULL Constraint : Used to prevent any null value from ent...
RELATIONAL ALGEBRA

A set of operators used to perform operations on tables is called as relational algebra. Operators in relational algebra take one or mor...
INTEGRITY RULES

Data integrity is to be maintained at any cost. If data loses integrity it becomes garbage. So every effort is to be made to ensure data...
SQL OPERATOR

A part from standard relational operators (= and >), SQL has some other operators that can be used in conditions. Operator ...
ENABLING AND DISABLING CONSTRAINTS

ALTER TABLE can be used to enable and disable constraints without dropping constraints.When a constraint is disabled, Oracle does not enfo...

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Popular Posts

ON DELETE CASCADE OPTION

As mentioned earlier, after a foreign key is defined, Oracle will NOT allow any parent row to be deleted if it has dependent rows in the c...
DELETING ROWS USING DELETE COMMAND

DELETE command is used to delete rows from a table. The following is the syntax of DELETE command. DELETE FROM table [WHERE condition;] ...
HOW TO ENTER SQL AND SQL*PLUS STATEMENTS?

How to enter SQL statements? : SQL*PLUS allow to types of command to entered at the prompt - SQL and SQL*PLUS. SQL commands include com...
CREATING SAMPLE TABLES 2

Batches table : Contains information about all the batches. These batches include batches that were completed, that are currently runnin...
TRANSACTION COMMAND

COMMIT Command : Used to commit all changes made since the beginning of the transaction. It does the following. Makes all the chang...
CREATING INTEGRITY CONSTRAINTS

In the following few sections we will see how to integrity constraints. NOT NULL Constraint : Used to prevent any null value from ent...
RELATIONAL ALGEBRA

A set of operators used to perform operations on tables is called as relational algebra. Operators in relational algebra take one or mor...
INTEGRITY RULES

Data integrity is to be maintained at any cost. If data loses integrity it becomes garbage. So every effort is to be made to ensure data...
SQL OPERATOR

A part from standard relational operators (= and >), SQL has some other operators that can be used in conditions. Operator ...
ENABLING AND DISABLING CONSTRAINTS

ALTER TABLE can be used to enable and disable constraints without dropping constraints.When a constraint is disabled, Oracle does not enfo...

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Popular Posts

ON DELETE CASCADE OPTION

As mentioned earlier, after a foreign key is defined, Oracle will NOT allow any parent row to be deleted if it has dependent rows in the c...
DELETING ROWS USING DELETE COMMAND

DELETE command is used to delete rows from a table. The following is the syntax of DELETE command. DELETE FROM table [WHERE condition;] ...
HOW TO ENTER SQL AND SQL*PLUS STATEMENTS?

How to enter SQL statements? : SQL*PLUS allow to types of command to entered at the prompt - SQL and SQL*PLUS. SQL commands include com...
CREATING SAMPLE TABLES 2

Batches table : Contains information about all the batches. These batches include batches that were completed, that are currently runnin...
TRANSACTION COMMAND

COMMIT Command : Used to commit all changes made since the beginning of the transaction. It does the following. Makes all the chang...
CREATING INTEGRITY CONSTRAINTS

In the following few sections we will see how to integrity constraints. NOT NULL Constraint : Used to prevent any null value from ent...
RELATIONAL ALGEBRA

A set of operators used to perform operations on tables is called as relational algebra. Operators in relational algebra take one or mor...
INTEGRITY RULES

Data integrity is to be maintained at any cost. If data loses integrity it becomes garbage. So every effort is to be made to ensure data...
SQL OPERATOR

A part from standard relational operators (= and >), SQL has some other operators that can be used in conditions. Operator ...
ENABLING AND DISABLING CONSTRAINTS

ALTER TABLE can be used to enable and disable constraints without dropping constraints.When a constraint is disabled, Oracle does not enfo...

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Blog Archive

▼ 2016 (25)
- ▼ June (8)
- ► May (1)
- ► April (16)

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