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...
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
|| 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. || 5. Removing a...
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); ...
Вэтомурокемыизучимбазовуюконцепциюциклав PL/SQL, потокуправления, типыимаркировкуциклов.
Oracle Database has tools to help you address these objectives: DML error loggingstores details of failed rows without raising an exception Use thereturning clauseto capture details of changed rows Usebulk processingif you need to combine non-SQL procedural processing with SQL statements ...
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]
Oracle PL/SQL查看执行计划 1.在PL/SQL中设置执行计划可查看的信息。2.在PL/SQL中输入Sql,按F5查看执行计划3.或者先执行SQL,Commit 再执行SQL便可看到执行计划: 4.如何看执行计划1.执行计划的执行顺序是由上至下,由右至左。 Oracle 查看执行计划
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production SQL> create table t1 as select object_id id , object_name,owner from dba_objects;Table created SQL> create table t2 as select object_id id , status,temporary from dba_objects;Table created SQL> BEGIN 2 DBMS_STATS....