当条件为 TRUE 时,我试图打印 TEXT。选择代码完全正常。当我只运行选择代码时,它显示 403 值。但是当条件存在时我必须打印一些文本。以下代码有什么问题。
BEGIN
IF EXISTS(
SELECT CE.S_REGNO FROM
COURSEOFFERING CO
JOIN CO_ENROLMENT CE
ON CE.CO_ID = CO.CO_ID
WHERE CE.S_REGNO=403 AND CE.COE_COMPLETIONSTATUS = 'C' AND CO.C_ID = 803
)
THEN
DBMS_OUTPUT.put_line('YES YOU CAN');
END;
这是错误报告:
Error report:
ORA-06550: line 5, column 1:
PLS-00103: Encountered the symbol "JOIN" when expecting one of the following:
) , with group having intersect minus start union where
connect
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:
最佳答案
IF EXISTS()
在语义上是不正确的。 EXISTS
条件只能在 SQL 语句中使用。因此,您可以按如下方式重写 pl/sql 块:
declare
l_exst number(1);
begin
select case
when exists(select ce.s_regno
from courseoffering co
join co_enrolment ce
on ce.co_id = co.co_id
where ce.s_regno=403
and ce.coe_completionstatus = 'C'
and ce.c_id = 803
and rownum = 1
)
then 1
else 0
end into l_exst
from dual;
if l_exst = 1
then
DBMS_OUTPUT.put_line('YES YOU CAN');
else
DBMS_OUTPUT.put_line('YOU CANNOT');
end if;
end;
或者您可以简单地使用
count
函数确实确定查询返回的行数,并且rownum=1
谓词 - 您只需要知道记录是否存在:declare
l_exst number;
begin
select count(*)
into l_exst
from courseoffering co
join co_enrolment ce
on ce.co_id = co.co_id
where ce.s_regno=403
and ce.coe_completionstatus = 'C'
and ce.c_id = 803
and rownum = 1;
if l_exst = 0
then
DBMS_OUTPUT.put_line('YOU CANNOT');
else
DBMS_OUTPUT.put_line('YES YOU CAN');
end if;
end;
关于sql - IF EXISTS 条件不适用于 PLSQL,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13217600/