REQUEST COMPLIMENTARY SQLS*PLUS LICENCE
Oracle FOR LOOP statement
In Oracle/PLSQL, the FOR LOOP cycle allows you to execute code again for a fixed number of times.
FOR LOOP statement syntax
FOR loop_counter IN [REVERSE] lowest_number...highest_number
LOOP
{...}
END LOOP;
Statement parameters and arguments
- loop_counter – a variable of the cycle counter in the FOR LOOP cycle.
- REVERSE is optional. If REVERSE is specified, the loop counter will be counted in reverse order.
- Low_number – initial value for loop_counter.
- highest_number – final value for loop_counter.
- statement – It is the code executed every time passing through a loop.
Note:
You can use the FOR LOOP loop when you want to execute the loop body a fixed number of times.
If the REVERSE parameter is specified, highest_number and lowest_number will have the start and end values for loop_counter respectively.
Example:
FOR Lcntr IN 1...20
LOOP
LCalc := Lcntr * 31;
END LOOP;
This example loop will run 20 times. The counter called LCntr will start with 1 and end with 20.
declare
LCalc number;
begin
FOR Lcntr IN 1...20
LOOP
LCalc := Lcntr * 31;
dbms_output.put_line(LCalc);
END LOOP;
end;
--Result
31
62
93
124
155
186
217
248
279
310
341
372
403
434
465
496
527
558
589
620
You can use the REVERSE modifier to run the loop in reverse order. For example:
FOR Lcntr IN REVERSE 1...15
LOOP
LCalc := Lcntr * 31;
END LOOP;
This example of the FOR LOOP loop will run 15 times. However, since REVERSE is specified, the counter is called LCntr, starts at 15 and ends at 1 (in fact, the loop is in the opposite direction).
Script text for example
declare
LCalc number;
begin
FOR Lcntr IN REVERSE 1...15
LOOP
LCalc := Lcntr * 31;
dbms_output.put_line(LCalc);
END LOOP;
end;
--Result:
465
434
403
372
341
310
279
248
217
186
155
124
93
62
PL/SQL tutorial: FOR Loop In Oracle Database
MORE NEWS
PreambleNoSql is not a replacement for SQL databases but is a valid alternative for many situations where standard SQL is not the best approach for...
PreambleMongoDB Conditional operators specify a condition to which the value of the document field shall correspond.Comparison Query Operators $eq...
5 Database management trends impacting database administrationIn the realm of database management systems, moreover half (52%) of your competitors feel...
The data type is defined as the type of data that any column or variable can store in MS SQL Server. What is the data type? When you create any table or...
PreambleMS SQL Server is a client-server architecture. MS SQL Server process starts with the client application sending a query.SQL Server accepts,...
First the basics: what is the master/slave?One database server (“master”) responds and can do anything. A lot of other database servers store copies of all...
PreambleAtom Hopper (based on Apache Abdera) for those who may not know is an open-source project sponsored by Rackspace. Today we will figure out how to...
PreambleMongoDB recently introduced its new aggregation structure. This structure provides a simpler solution for calculating aggregated values rather...
FlexibilityOne of the most advertised features of MongoDB is its flexibility. Flexibility, however, is a double-edged sword. More flexibility means more...
PreambleSQLShell is a cross-platform command-line tool for SQL, similar to psql for PostgreSQL or MySQL command-line tool for MySQL.Why use it?If you...
PreambleWriting an application on top of the framework on top of the driver on top of the database is a bit like a game on the phone: you say “insert...
PreambleOracle Coherence is a distributed cache that is functionally comparable with Memcached. In addition to the basic function of the API cache, it...
PreambleIBM pureXML, a proprietary XML database built on a relational mechanism (designed for puns) that offers both relational ( SQL / XML ) and...
What is PostgreSQL array? In PostgreSQL we can define a column as an array of valid data types. The data type can be built-in, custom or enumerated....
PreambleIf you are a Linux sysadmin or developer, there comes a time when you need to manage an Oracle database that can work in your environment.In this...
PreambleStarting with Microsoft SQL Server 2008, by default, the group of local administrators is no longer added to SQL Server administrators during the...