[英]oracle trigger delete after insert
I have a table "person"我有一张桌子“人”
id groupId occupation state
1 5 DIRECTOR RETIREMENT
2 5 TEACHER VACATION
3 4 DIRECTOR ACTIVE
I need a trigger that delete new inserted row if it has the same grupiId, the same occupation and state ACTIVE.我需要一个触发器来删除新插入的行,如果它具有相同的 grupiId、相同的职业和state ACTIVE。 For example: If I insert a row with groupId 4, function Teacher, state wherever - it's OK.
例如:如果我在任何地方插入 groupId 为 4、function Teacher、state 的行 - 没关系。 If I insert a row with groupId 4, function Director, state HOLIDAY- it's OK.
如果我插入一行 groupId 为 4,function Director,state HOLIDAY - 没关系。 But If I insert a row with groupId 4, function Director, state ACTIVE it should be deleted after insertion
但是如果我插入一行 groupId 4, function Director, state ACTIVE 它应该在插入后删除
Don't use a trigger for this.不要为此使用触发器。 Just use a unique constraint or index:
只需使用唯一约束或索引:
alter table person add constraint unq_person_groupid_function
unique (groupid, function);
As a note: function
is a poor choice for a column name, because it is a SQL keyword.注意:
function
是列名的错误选择,因为它是 SQL 关键字。
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