Postgresql Cursor For Loop Example

PL/SQL cursor FOR loop has one great advantage of loop continued until row not found. In sometime you require to use explicit cursor with FOR loop instead of use OPEN, FETCH, and CLOSE statement.

FOR loop iterate repeatedly and fetches rows of values from database until row not found.

Explicit Cursor FOR LOOP Example

  • Declaring Cursor Variables. All access to cursors in PL/pgSQL goes through cursor variables, which are always of the special data type refcursor.One way to create a cursor variable is just to declare it as a variable of type refcursor.Another way is to use the cursor declaration syntax, which in general is.
  • PL/SQL cursor FOR loop has one great advantage of loop continued until row not found. In sometime you require to use explicit cursor with FOR loop instead of use OPEN, FETCH, and CLOSE statement. FOR loop iterate repeatedly and fetches rows of values from database until row not found. Explicit Cursor FOR LOOP Example.
  • Cursor For Loop: Oracle provides another loop-statements to control loops specifically for cursors. This statements is a variation of the basic FOR loop, and it is known as cursor for loops. Syntax: FOR VARIABLE IN CURSORNAME LOOP END LOOP Parameterized Cursors.
Postgresql Cursor For Loop Example

following one emp_information table:

For

Postgresql cursor loop example, String sum and receiving multiple row result query in comma separated single row. Execution result of the query in Postgresql Function. PostgreSQL provides equivalent ROWCOUNT for the same purpose. REF CURSOR is Oracle data type that represents the cursor, every cursor variable must be defined with a type derived from REF CURSOR. PostgreSQL provides equivalent REFCURSOR for the same purpose. Oracle allows to iterate rows in cursor using the following cycle.

Postgresql cursor for loop example sentences
EMP_NOEMP_NAMEEMP_DEPTEMP_SALARY
1Forbs rossWeb Developer45k
2marks jemsProgram Developer38k
3SaulinProgram Developer34k
4Zenia SrollWeb Developer42k
Cursor

Display employee number wise first two employee details emp,

Example

cursor_for_loop.sql

Result

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Cursor

Postgresql Cursor For Loop Examples

SQL>@cursor_for_loop
EMP_No: 1
EMP_Name: Forbs ross
EMP_Dept: Web Developer
EMP_Salary:45k
EMP_No: 2
EMP_Name: marks jems
EMP_Dept: Program Developer
EMP_Salary:38k
PL/SQL procedure successfully completed.

Cursors In Postgresql Tutorial