原始产品版本:SQL Server 原始KB 数: 70956 总结 可使用两种常用方法从 SQL Server 表中删除重复记录。 要进行演示,请首先创建示例表和数据: SQL 复制 CREATE TABLE original_table (key_value int ) INSERT INTO original_table values (1) INSERT INTO original_table values (1) INSERT INTO...
-- insert data with duplicate, C++ is repeated 3 times, while Java 2 times insert into #programming values ('Java'); insert into #programming values ('C++'); insert into #programming values ('JavaScript'); insert into #programming values ('Python'); insert into #programming values ('C++'...
SQL Server Delete Duplicate Rows There can be two types of duplication of rows in a table 1. Entire row getting duplicated because there is no primary key or unique key. 2. Only primary key or unique key value is different, but remaining all values are same. Scenario 1: Delete duplicate ...
. To ensure that only 10 rows are deleted, the column specified in the subselect statement (PurchaseOrderID) is the primary key of the table. Using a nonkey column in the subselect statement may result in the deletion of more than 10 rows if the specified column contains duplicate values....
Msg 1505, Level 16, State 1 Create unique index aborted on duplicate key. 如果使用的是 SQL Server 2000 或 SQL Server 2005,则会收到以下错误消息: Msg 1505, Level 16, State 1 CREATE UNIQUE INDEX terminated because a duplicate key was found for object name '%.*ls' and index name '%.*...
Using a nonkey column in the subselect statement may result in the deletion of more than 10 rows if the specified column contains duplicate values.SQL Copy DELETE FROM Purchasing.PurchaseOrderDetail WHERE PurchaseOrderDetailID IN (SELECT TOP 10 PurchaseOrderDetailID FROM Purchasing.PurchaseOrder...
VALUES (1,'A',34), (1,'A',34), (2,'B',37), (3,'C',21), (3,'C',21), (3,'C',21); GO SELECT id,name,age FROM Test; -- Now delete the duplicate records WITH CTE(id,name,age,Duplicates) AS ( SELECT id,name,age, ...
sql server删除用户命令 sql删除用户账号命令是,1.用户管理创建用户CREATEUSER用户名[IDENTIFIEDBY'密码'][,用户名[IDENTIFIEDBY'密码']];CREATEUSERzhang3IDENTIFIEDBY'123123';#默认host是%表示任何地址都可以连接CREATEUSER'kangshifu'@'localhost'IDENTIFIEDBY'123456
c , ID from table group by duplicate_col have c > 1;这样拿到的id都是duplicate的id，delete ...
CREATE TABLE TestBatch (ColA INT PRIMARY KEY, ColB CHAR(3)); GO INSERT INTO TestBatch VALUES (1, 'aaa'); INSERT INTO TestBatch VALUES (2, 'bbb'); INSERT INTO TestBatch VALUES (1, 'ccc'); -- Duplicate key error. GO SELECT * FROM TestBatch; -- Returns rows 1 and 2...