SELECT column_name FROM table_name WHERE column_name NOT IN (SELECT column_name FROM another_table) 注意,"NOT IN"操作符在使用时需要确保子查询的结果集不包含NULL值,否则可能导致不符合预期的结果。 "NOT EXISTS": "NOT EXISTS"操作符用于判断子查询的结果集是否为空,如果为空,则返回真(True)。它通...
TheNOT INoperator in SQL is used to fetch all the records that aren’t present based on a particular field. We can use this operator to select records from one table that aren’t present in another table: SELECT * FROM Course c WHERE c.id NOT IN ( SELECT r.course_id FROM Registratio...
SELECT*FROM(SELECTCustomerID,ProductID,QuantityFROMOrders)ASSourceTablePIVOT(SUM(Quantity)FORProductIDI...
DELIMITER // CREATE PROCEDURE my_procedure (IN param1 INT, OUT result INT) BEGIN -- 存储过程的SQL语句SELECT column1 INTO result FROM my_table WHERE another_column = param1; END // DELIMITER ; 在上述示例中: my_procedure 是存储过程的名称。 (IN param1 INT, OUT result INT) 定义了输入参数...
-- copy contents of a table to another databaseSELECT*INTOCustomersCopyINanother_db.mdbFROMCustomers; Here, the SQL command copies theCustomerstable to theCustomersCopytable in theanother_db.mdbdatabase. Note:The user must haveWRITEprivilege to copy data to a table in a different database. ...
SELECT INTO 语句 SELECT INTO 语句从一个表中选取数据,然后把数据插入另一个表中。 SELECT INTO 语句常用于创建表的备份复件或者用于对记录进行存档。 SQL SELECT INTO 语法 您可以把所有的列插入新表: SELECT * INTO new_table_name [IN externaldatabase] ...
當已指定 TABLOCK 提示,或者使用 table lock on bulk load 設定了 資料表選項。 提示 與BULK INSERT 陳述式 (其持有較不嚴格的大量更新 (BU) 鎖定) 不同,具 INSERT INTO...SELECT 提示的 TABLOCK 對資料表持有意圖獨佔 (IX) 鎖定。 這代表您無法使用平行插入作業插入資料列。 索引鍵範圍...
How to SELECT data from a table which is not present in another table with SQL is a common operation in databases. There are many ways to query this, like using NOT IN and NOT EXISTS. But the most efficient way is to use LEFT JOIN....
Select only the first 3 records of the Customers table: SELECTTOP3*FROMCustomers; Try it Yourself » Note:Not all database systems support theSELECT TOPclause. MySQL supports theLIMITclause to select a limited number of records, while Oracle usesFETCH FIRSTnROWS ONLYandROWNUM. ...
指定了 TABLOCK 提示或使用 table lock on bulk load 设置 表选项。 提示 与持有较少限制性批量更新 (BU) 锁的 BULK INSERT 语句不同,具有 INSERT INTO...SELECT 提示的 TABLOCK 语句持有一个针对表的意向排他 (IX)锁。 也就是说你不能使用并行插入操作插入行。 键范围锁 在使用 SERIALIZABLE 事务隔...