带连接的Oracle SQL触发器
我遗漏了什么？导致错误的不是带连接的Oracle SQL触发器,sql,oracle,plsql,triggers,Sql,Oracle,Plsql,Triggers,我遗漏了什么？导致错误的不是连接，而是子查询的使用在此上下文中是无效的。首先选择值（如果，则从中选择），以后再使用。大概是这样的： Error(6,93): PLS-00103: Encountered the symbol "JOIN" when expecting one of the following: ) , with group having intersect minus start union where connect The symbol &
连接，而是子查询的使用在此上下文中是无效的。首先选择值（如果，则从中选择），以后再使用。大概是这样的：
Error(6,93): PLS-00103: Encountered the symbol "JOIN" when expecting one of the following: ) , with group having intersect minus start union where connect The symbol "," was substituted for "JOIN" to continue.
创建或替换触发器\u名称
插入前
--或者更新-->什么？
关于表名
每行
声明
l_colu_b table_b.colu_b%类型；
开始
如果插入
然后
选择col_b
进入l_Colub
从表a自然联接表b
其中some_col=：new.some_value；
IF:new.colu\u a
此外，请使用表别名。不可能知道哪个列属于哪个表。此外，您的触发器希望在更新
之前触发。。。什么？我把它注释掉了
Error(6,93): PLS-00103: Encountered the symbol "JOIN" when expecting one of the following: ) , with group having intersect minus start union where connect The symbol "," was substituted for "JOIN" to continue.
CREATE OR REPLACE TRIGGER trigger_name
BEFORE INSERT
--OR UPDATE of --> of what?
ON table_name
FOR EACH ROW
DECLARE
l_col_b table_b.col_b%TYPE;
BEGIN
IF INSERTING
THEN
SELECT col_b
INTO l_col_b
FROM table_a NATURAL JOIN table_b
WHERE some_col = :new.some_value;
IF :new.col_a < l_col_b
THEN
raise_application_error (-20000, 'Raise some error');
END IF;
END IF;
END;