Steven Feuersteingives us the following recommendations about cursor FOR loops which he learned from one of his mentors in the PL/SQL world, Bryn Llewellyn, Oracle’s PL/SQL product manager: Never use a cursor FOR loop when you’re writing new code for normal production deployment in a multiu...
尤其在执行UPDATE/DELETE语句时请千万注意,ORACLE是先执行脚本同时显示执行计划的,即使使用set autotrace on traceonly explain; 这个时候推荐使用EXPLAIN PLAN FOR来看或者PL/SQL等第三方工具 复制代码 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23...
Cursor for loop for rec in (select col_1, col_2 from table_a) loop /*Statements, use rec.col_1 and rec.col_2 */ end loop; for rec in cursor_name loop /*Statements, use rec.col_1 and rec.col_2 */ end loop; for rec in cursor_name(cursor_param_1, cursor_param_2...) lo...
) - 85, 3000, null, 20); SQL> SQL> SQL> declare 2 cursor c_dept is 3 select * 4 from dept; 5 r_dept c_dept%ROWTYPE; 6 cursor c_empInDept (cin_deptNo NUMBER) is 7 select * 8 from emp 9 where deptNo = cin_deptNo; 10 11 r_emp c_empInDept%ROWTYPE; 12 ...
|| in a list of values and the LAST method returns the highest || index value. The index value is alway an integer for user-defined || ADT (Attribute Data Type) collections, but may be a string for || an associative array or a PL/SQL list indexed by a string. ...
Oracle loops - endless looping, While loop, Repeat-until loop and For loop, Explain uses of endless looping in PL/SQL with an example - End less looping has no bounds and the program continues to operate endlessly until EXIT WHEN condition evaluates to T
Loops with PL/SQL Types of loops Basic loop loop /* statements */ end loop; While loop while a > b loop /* statements */ end loop See also Iterating over collection variables. For loop for i in 1..1000 loop insert into a values(i,i*2); ...
Second type of PL/SQL Loop: While Loop In the WHILE loop the condition is checked at the beginning. If false, the loop terminates without a single execution of the statement. If true, the statements within the loop are executed. The loop will repeat until, the condition becomes false. ...
Вэтомурокемыизучимбазовуюконцепциюциклав PL/SQL, потокуправления, типыимаркировкуциклов.
Name CTL-08: Scan collections using FIRST, LAST, and NEXT in loops. Synopsis A collection in PL/SQL is like a single-dimensional array. A collection differs from an array, however, in that … - Selection from Oracle PL/SQL Best Practices [Book]