SQL Multiple Insert是一种在数据库中一次性插入多行数据的操作。它可以提高插入数据的效率,减少与数据库的交互次数,从而提升系统性能。 SQL Multiple Insert可以通过以...
當開啟預設結果集時,應用程式可以執行其他陳述式 (例如 INSERT、UPDATE、DELETE 和預存程序呼叫)。 以下的指導方針對於使用 MARS 的應用程式非常有用: 預設結果集應該用於單一 SQL 陳述式 (SELECT、DML with OUTPUT、RECEIVE、READ TEXT 等等) 所產生的短期或簡短結果集。
當開啟預設結果集時,應用程式可以執行其他陳述式 (例如 INSERT、UPDATE、DELETE 和預存程序呼叫)。 以下的指導方針對於使用 MARS 的應用程式非常有用: 預設結果集應該用於單一 SQL 陳述式 (SELECT、DML with OUTPUT、RECEIVE、READ TEXT 等等) 所產生的短期或簡短結果集。
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使用一句SQL INSERT多筆Record(multiple values) 此功能在MySQL在3.22.5之後就有的功能,SQL Server在這個SQL Server 2008版本才加入此功能 -- 切換測試資料庫 USE MyDB GO -- 建一個測試資料表 CREATE TABLE [mytable] ( myid nvarchar(10) ,givenName ...
例1: (明确指定主键索引,并且有此笔资料,row lock) SELECT * FROM products WHERE id='3' FOR UPDATE; 例2: (明确指定主键索引,若查无此笔资料,无lock) SELECT * FROM products WHERE id='-1' FOR UPDATE; 例2: (无主键索引,table lock)
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As you can see, every time the customer finalizes the order we have to insert order details into the Orders table and insert a row for every item in the shopping cart into the Order_Items table. Typically, a multi-insert operation like this would be handled by executing theINSERT statement...
This trigger also works correctly in a single-row insert; the sum of the LineTotal value column is the sum of a single row. However, with this trigger the correlated subquery and the IN operator that is used in the WHERE clause require additional processing from SQL Server. This is unneces...
Which means we really only have to scale back insertmanyvalues,in the unit of work. Also for SQL Server, I pulled out "insertmanyvalues" entirely even for non-returning cases which is overkill. since it seems like all the DBs we're going to have to worry about this, we can: ...