exec usage in oracle

EXEC is an Oracle statement used to execute stored procedures or other SQL statements. Use EXEC syntax: EXEC [schema_name.]procedure_name [parameter1, parameter2, ...] (where [schema_name] is the stored procedure schema, [procedure_name] is the stored procedure name, [parameter1, parameter2, ...] is the optional parameter ). EXEC can be used to call stored procedures, execute complex SQL statements, encapsulate SQL statements, and improve performance.

EXEC usage in Oracle

What is EXEC?

EXEC is an Oracle statement used to execute stored procedures or other SQL statements.

How to use EXEC?

EXEC syntax is as follows:

<code>EXEC [schema_name.]procedure_name [parameter1, parameter2, ...]</code>

where:

• schema_name is the name of the schema where the stored procedure is located.
• procedure_name is the name of the stored procedure to be executed.
• parameter1, parameter2, ... are the parameters passed to the stored procedure (optional).

When to use EXEC?

You can use EXEC to perform the following tasks:

• Call stored procedures
• Execute complex or repeated SQL statements
• Encapsulate SQL statements into reusable modules
• Improve performance (stored procedures are usually faster than executing SQL statements directly)

Example

The following example demonstrates how to call a stored procedure using EXEC:

EXEC hr.get_employee_name(100);

This statement will execute the hr.get_employee_name stored procedure, passing employee ID 100 as a parameter.

Parameters

EXEC can accept the following types of parameters:

• Input parameters: Passed to the stored procedure value.
• Output parameters: Value modified by the stored procedure.
• Input/output parameters: Parameters used as both input and output values.

Use the IN, OUT and IN OUT keywords to specify parameter types.

Note

• EXEC can only execute stored procedures stored in the current database.
• If the stored procedure does not exist or the user does not have execution permission, an error will be thrown.
• The parameter type passed to EXEC must match the type of the stored procedure parameter.

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