Delete with subqueryPosted by: Anette B Date: May 13, 2008 03:13AM Hi, I have this query which gets the error message: "Returns: #1093 - You can't specify target table 'tasks' for update in FROM clause" delete FROM tasks WHERE perf_id IN ( SELECT perf_id FROM tasks WHERE...
Execute aSELECTquerythat returns the primary key values for the rows that you want to delete. When writing theSELECTquery: Use aWHEREclause that filters on the column identifying the rows. Add anAS OF SYSTEM TIMEclauseto the end of the selection subquery, or run the selection query in a se...
Combining conditional COUNTs in one GROUP BY query Commenting out an SQL Line when using Dynamic SQL Common table expression defined but not used.. why? Common Table Expression Select Into With Subquery Common Table Expression with Primary Key Syntax??? Common Table Expression...Naming Standard?
This query removes only the records from the `orders` table where the `order_status` is 'canceled', effectively cleaning up unwanted data. 3. Deleting with Subquery sql--Delete products that are listedinthe obsolete_products tableDELETEFROMproductsWHEREproduct_idIN(SELECTproduct_idFROMobsolete_produ...
subquery 删除目标对象可以是子查询,在对子查询中的数据进行删除时,会将子查询当成一个临时视图,支持在子查询后面加CHECK OPTION选项。 [ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [/*+ plan_hint */] [ ALL ] { * | {expression [ [ AS ] output_name ]} [, ...] } [ into_optio...
Example 1. Delete query containing a WHERE clause This example requires theQuery Deleteprivilege onhotel. sql++ ViewCopy DELETEFROMhotel; Example 2. Delete queries containing a subquery This example requires theQuery Deleteprivilege onairportand theQuery Selectprivilege on`beer-sample`. ...
[,table_name[.*]]...USINGtable_references[WHEREwhere_condition]where_condition: expression order_expression_list: order_expression[,order_expression...]order_expression: expression[ASC|DESC]limit_row_count: INT_VALUE table_references: {table_name|joined_table|table_subquery|select_with_parents}[,...
..] order_expression: expression [ASC | DESC] limit_row_count: INT_VALUE table_references: {table_name | joined_table | table_subquery | select_with_parents} [, ...] 参数解释 参数描述 hint_options 指定hint 选项。 table_name 指定需要删除的表名。 partition_name 需要删除表的对应分区名。
"Using the WITH CHECK OPTION Clause: Example" table_collection_expression Thetable_collection_expressionlets you inform Oracle that the value ofcollection_expressionshould be treated as a table for purposes of query and DML operations. Thecollection_expressioncan be a subquery, a column, a function...
select * from t_table_1 semi join t_table_2 where (`t_table_2`.`uid` = 1 and `t_table_1`.`task_id` = `t_table_2`.`id`)" 可以看到优化器这次选择将in转换成semijoin了,观察执行计划可以看到走了索引。 那如果换成delete呢?同样保持开关打开,跟踪如下:"steps": [ { "expanded_query...