SqlQuery q =newSqlQuery(WAFRuntime.Engine.Dao); q.Delete(table); q.Where(id == r); q.ExecuteNonQuery(); }// dropping tableWAFRuntime.Engine.Dao.DbProvider.UpdateDatabase(newDbAction[] { DbAction.DeleteTable(tableName) }.ToList()); } 开发者ID:kyvkri,项目名称:MG,代码行数:64,代码...
訊息文字: Subselect for materialized query table &1 not valid for reason code &3. 原因文字: &1 in &2 cannot be created or altered because the SELECT statement contains a reference or expression that is not valid. 原因碼及其意義如下: 1 -- 參照另一個具體化查詢表格或受保護的系統檔案,或參照...
We can use the SQL DELETE statement to delete specific rows from a table based on a single condition using the WHERE clause. SyntaxFollowing is the syntax for deleting specific rows based on single condition −DELETE FROM table_name WHERE condition; ...
Unfortunately for all the answers given by other folks, you can't DELETE and SELECT from a given table in the same query. DELETE FROM mytable WHERE id NOT IN (SELECT MAX(id) FROM mytable); ERROR 1093 (HY000): You can't specify target table 'mytable' for update in FROM clause ...
The first query did that without using JOIN, while in the 2nd query, we’ve used CROSS JOIN. 第一个查询在不使用JOIN的情况下做到了这一点,而在第二个查询中,我们使用了CROSS JOIN。 For the first query, the important thing to mention is that we wanted a Cartesian product. Therefore, we’ve...
Example 3: DELETE All RecordsSuppose you want to start fresh by deleting all records from a table named “LogEntries”: DELETE FROM LogEntries; This query will delete all records from the “LogEntries” table. Example 4: DELETE with JOINIf you have a related table structure, you might use...
Create an INSTEAD OF trigger on the table. Create a view for users to access. Attempt to delete one row. Query the HREmployee table as an administrator. Query the view as an end user. Create a new table: CREATETABLEHREmployees(EmployeeIDINT,FirstNameVARCHAR(20),LastNameVARCHAR(20),isActi...
解释额外的信息。包含mysql对于query优化的时候的一些附加信息。非常有用。可能出现的结果如下: const row not found 该表为空 Deleting all rows 表格内数据被标记删除,正在删除中(某些存储引擎支持一种方法,以简单快捷的方式删除所有行,这时查询就会出现这个提示) ...
When a UNIONed view existed to simplify user and application access, the query processor had to access every underlying table in order to determine what data was needed for the result set. If only a limited subset of the underlying tables was needed, then each user and developer needed ...
When a UNIONed view existed to simplify user and application access, the query processor had to access every underlying table in order to determine what data was needed for the result set. If only a limited subset of the underlying tables was needed, then each user and developer needed to ...