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 a look at an example. FOR Lcntr IN 1..20 LOOP LCalc := Lcntr * 31; END LOOP; This example will loop 20 ...
WHILE DO dropprocedureifexistsp_while_do;createprocedurep_while_do()begindeclareiint;seti=1;whilei<=10doselectconcat('index :', i);seti=i+1;endwhile;end; call p_while_do(); FOR LOOP dropprocedureifexistsp_for_loop;createprocedurep_for_loop()begindeclareiint;seti=1; loop_example : l...
END LOOP; RETURN total_val; END; In this example, we've created a cursor called c1. TheCURSOR FOR Loopwill terminate after all records have been fetched from the cursor c1. 译:在这个示例中,我们建立了一个名为c1的cursor。当所有c1中的记录都取后,CURSOR FOR Loop就会终止。
For udx in 1..v_example.count loop // 用这种方法必须要确定行是连续填充的,下界是一个 // 定的值。 Dbms_output.put_line(to_char(v_example_tab(idx))); End loop; V_example_tab.delete(1) ; // 删除第一个索引的记录 V_example_tab.delete(2,5);// 删除第 2 至第 5 个索引记录 V_...
FOR i IN 1..10 LOOP -- 循环体 END LOOP; 游标 用于逐行处理查询结果集。 显式游标示例: DECLARE CURSOR c_employee IS SELECT employee_id, first_name FROM employees; v_employee_id employees.employee_id%TYPE; v_first_name employees.first_name%TYPE; BEGIN OPEN c_employee; LOOP FETCH c_empl...
For example: DECLARE CURSOR emp_cursor IS SELECT ename,sal FROM emp; emp_reocrd emp_cursor%ROWTYPE; BEGIN OPEN emp_cursor; LOOP FETCH emp_cursor INTO emp_record; EXIT WHEN emp_record%NOTFOUND; dbms_ouput.put_line(‘雇员名:’||emp_record.ename||’,雇员工资:’||emp_record.sal); ...
在PL/SQL中,使用ALTER TABLE语句来修改表的字符集可以按照以下步骤进行: 确认需要修改的表名和新的字符集: 表名:假设你要修改的表名为example_table。 新的字符集:假设你要修改为AL32UTF8。 编写ALTER TABLE语句,指定要修改的表和新的字符集: sql ALTER TABLE example_table CONVERT TO CHARACTER SET AL32...
The loop breaks if <condition> is true. For example, here is a way to insert each of the pairs (1, 1) through (100, 100) into T1 of the above two examples:DECLAREi NUMBER := 1;BEGINLOOPINSERT INTO T1 VALUES(i,i);i := i+1;...
FOR i IN 1..t2_data.count LOOP IF ( t2_data(i).a = cur.ay AND t2_data(i).c > 0 ) OR ( cur.ay IS NULL AND t2_data(i).a NOT MEMBER OF taken AND t2_data(i).c > 0 ) THEN a_freqs(i) := cum_freq + t2_data(i).c; cum_freq := cum_freq + t2_data(i).c; ...
词法单位可由以下分割:定界符（Delimiters）标识符（Identifiers）文字（Literals）注释（Comments）定界符：定...