The syntax for the FOR Loop is: FOR loop_counter IN [REVERSE] lowest_number..highest_number LOOP {.statements.} END LOOP; You would use a FOR Loop when you want to execute the loop body a fixed number of times. 译:当你需循环体执行一定的次数的时候,就可以使用FOR Loop。 Let's take ...
Loops with PL/SQL: http://www.adp-gmbh.ch/ora/plsql/loops.html The syntax for the FOR Loop is: FOR loop_counter IN [REVERSE] lowest_number..highest_number LOOP {.statements.} END LOOP; You would use a FOR Loop when you want to execute the loop body a fixed number of times. Let...
The syntax for theCURSOR FOR Loopis: FOR record_index incursor_name LOOP {.statements.} END LOOP; You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当...
The following illustrates the syntax of the cursorFOR LOOPstatement: FORrecordINcursor_nameLOOPprocess_record_statements;ENDLOOP;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) 1) record Therecordis the name of the index that the cursorFOR LOOPstatement declares implicitly as a%ROWTYPEreco...
Introduction to PL/pgSQL Loop statement Theloopdefines an unconditional loop that executes a block of code repeatedly until terminated by anexitorreturnstatement. The following illustrates the syntax of theloopstatement: <>loopstatements;end loop; Typically...
This is an expression that yields the Boolean valueTRUE,FALSE, orNULL. It is associated with a sequence of statements, which is executed only if the expression yieldsTRUE. For the syntax ofboolean_expression, see"Expressions". cursor_for_loop_statement ...
Introduction to PL/SQL WHILE loop statement PL/SQLWHILEloop is a control structure that repeatedly executes acode blockas long as a specific condition remains true. Here’s the syntax for theWHILEloop statement: WHILEconditionLOOPstatements;ENDLOOP;Code language:PostgreSQL SQL dialect and PL/pgSQL...
在END LOOP 后边写上标志 ( inner_loop, outer_loop ) 是好习惯。 5. Composite Data Types - PL/SQL records - PL/SQL collections ( index by table , nested table, varray ) ( 貌似这种不常用 ) ( 就是将多种相关的数据集中在一起看,比如 employeer, 有 name, salary, birthday, 等等,虽然 nam...
Introduction to PL/pgSQL while loop statement Thewhileloop statement executes one or more statements as long as a specified condition is true. Here’s the basic syntax of awhileloop statement: [ <> ]whileconditionloopstatements;endloop; In this...
Control structures are the most important PL/SQL extension to SQL. Not only does PL/SQL let you manipulate Oracle data, it lets you process the data using conditional, iterative, and sequential flow-of-control statements such asIF-THEN-ELSE,CASE,FOR-LOOP,WHILE-LOOP,EXIT-WHEN, andGOTO. Collec...