UPDATE tablea a 代码语言:txt AI代码解释 SET a.fieldforupdate = (SELECT b.fieldsource FROM tableb b WHERE a.keyfield = b.keyfield) 代码语言:txt AI代码解释 WHERE EXISTS (SELECT b.fieldsource FROM tableb b WHERE a.keyfield = b.keyfield); 有三点需要注意:1. 对于一个给定的a.keyfield...
update a set value = 'test' from a join b on a.b_id = b.id join c on b.c_id = c.id where a.key = 'test' and c.value = 'test'; 按照上边的sql,本意是a、b、c三表关联,当c的value是’test’且a的key也是’test’的时候,就将a的value也改为’test’。但实际上这个sql有大问题,...
dbo.Table2.ColB = dbo.Table2.ColB + dbo.Table1.ColB FROM dbo.Table2 INNER JOIN dbo.Table1 ON (dbo.Table2.ColA = dbo.Table1.ColA); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31...
"Referring to Objects in Remote Databases" for more information on referring to database links "Distributed Queries" for more information about distributed queries and "Using Distributed Queries: Example"If you omit dblink, then Oracle assumes that the table, view, or materialized view is on the ...
CHECK OPTIONto indicate that Oracle Database prohibits any changes to the table or view that would produce rows that are not included in the subquery. When used in the subquery of a DML statement, you can specify this clause in a subquery in theFROMclause but not in subquery in theWHERE...
报错信息如下: [Code: 1093, SQL State: HY000] You can’t specify target table ‘bd_bankaccbas’ for update in FROM clause 译文: 不能在 FROM 子句中指定目标表 ‘bd_bankaccbas’ 进行更新。 有问题的 SQL 语句如下,它在 oracle 数据库的语法是支持的,但是 mysql 就不支持直接这么写: from 和upd...
在执行 mysql 语句时,出现1093 - You can't specify target table 'daily_job' for update in FROM clause这个错误。 二、错误原因 出现1093 - You can't specify target table 'daily_job' for update in FROM clause这个错误,它表面的意思是不能在同一个sql语句中,先select同一个表的某些值,然后再update...
These patches address vulnerabilities in Oracle code and in third party components included in Oracle products. These patches are usually cumulative, but each advisory describes only the security patches added since the previous Critical Patch Update Advisory. Thus, prior Critical Patch Update advisories...
2、将外层查询修改为 where exits(SELECT 1 FROM table_B where A.表的条件) --加租的这句话就是从B表中拿一条满足A表查询条件的数据去update. 为什么要增加exists? 如果不加exists ,没有匹配上的字段都会置为空值;所以必须要加 where exists 限制条件。
Therefore, semi-consistent read is instead implemented in multi-table UPDATE, in this WL. "Single code path for multi-table and single-table UPDATE (DELETE)" is a bigger-size change which could be a follow-up, later. Copyright (c) 2000, 2025, Oracle Corporation and/or its affiliates. ...