Oracle删除跳过锁定

Question

oracle 是否允许在某些条件下从 table 中删除行并跳过锁定一次

DELETE from t 
 WHERE t.id IN (SELECT id 
                  FROM t 
                 WHERE id in ('1','2') 
                   FOR UPDATE SKIP LOCKED )

例如 id 2 被其他会话锁定，删除脚本应该跳过该行

上面的查询总是失败并出现错误

ORA-00907: missing right parenthesis

版本：Oracle 11G XE

Answer 1

FOR UPDATE子句仅对顶级SQL语句有效，对子查询无效。

http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_10002.htm#SQLRF55370

Answer 2

根据 Jeffrey 的回答，我认为该条款旨在用于 PL/SQL 块。所以你可以试试这个，例如：

begin
  for r in (select rowid as rid from t for update skip locked)
  loop
    delete from t where rowid = r.rid;
  end loop;
end;
/

Oracle删除跳过锁定

Oracle delete skip locked

oracle

sql-delete

dml