Question

我创建了一个for循环，循环直到它达到10并且每次碰到6或8时输出INSERT现在我想在每次碰到6或8时在结果列中插入一个空值。我怎么能这样做？

declare var1 number := 0;
begin
loop exit when var1 > 10; 
if var1 IN (6,8) THEN dbms_output.put_line(' INSERT'); ELSE
dbms_output.put_line(var1);
end if;
var1 := var1 + 1;
end loop;
dbms_output.put_line('Done');
end;
/

表

 SQL> describe messages
 Name                                      Null?    Type
  ----------------------------------------- -------- ----------------------------

 RESULTS                                            VARCHAR2(60)

Answer 1

在dbms_output.put_line(' INSERT');之后写下你的插入语句。

然后决定是自动提交，还是最后手动提交。

Answer 2

SQL> describe messages
 Name                                     Null?    Type
 ---------------------------------------- -------- ----------------------------
 RESULTS                                           VARCHAR2(60)

SQL> SELECT COUNT(*) FROM messages;

  COUNT(*)
----------
         0

SQL> SELECT * FROM messages;

no rows selected

SQL> get a.sql
  1  DECLARE
  2    var1 NUMBER := 0;
  3  BEGIN
  4    LOOP
  5      EXIT WHEN var1 > 10;
  6      IF var1 IN (6,8) THEN
  7        DBMS_OUTPUT.PUT_LINE(' INSERT');
  8        INSERT INTO messages VALUES (NULL);
  9      ELSE
 10        DBMS_OUTPUT.PUT_LINE(var1);
 11      END IF;
 12      var1 := var1 + 1;
 13    END LOOP;
 14    DBMS_OUTPUT.PUT_LINE('Done.');
 15* END;
 16  
 17  /
0
1
2
3
4
5
INSERT
7
INSERT
9
10
Done.

PL/SQL procedure successfully completed.

SQL> SELECT COUNT(*) FROM messages;

  COUNT(*)
----------
         2

SQL> SELECT * FROM messages;

RESULTS
------------------------------------------------------------



SQL>

将数据插入表格中的列

2 个答案: