Scenario 2.a: Delete Duplicate rows but keep one using CTE We need to use the technique of Self Join initially to check for duplicate records containing different custid but same passport number. select distinct a.* from customers2 a join customers2 b on a.custid <> b.custid and a.CustN...
How to Delete Duplicate Records in SQL Server Usually on daily basis we usually need to perform removing duplicate records from a table. This post can help you to understand “How to Delete Duplicate Records in SQL Server”. Here consider an example for removing duplicate records. IF EXISTS(SE...
How to Delete the Duplicate Rows Delete key1by Büşra ÖZCOŞKUNCC BY-SA 4.0 Now you've identified the copies, you often want to delete the extra rows. For simplicity, I'm going to assume that either the rows are exact copies or you don't care which you remove. If there is on...
How to Delete One Row or Multiple Rows We can delete one or more records (commonly known as rows) from a table using the delete statement. The Delete statement removes some or all data (rows) from a table. According to Microsoft documentation, the Delete statement removes one or more rows...
当SQL 对 SELECT 语句进行求值时,根据满足 SELECT 语句的搜索条件的行数,可能有几行符合结果表中的条件。 结果表中的某些行可能重复。 您可以使用 DISTINCT 关键字指定不需要任何重复项,后跟表达式列表: SELECT DISTINCTJOB, SEX ... DISTINCT 表示您只想选择唯一行。 如果所选行与结果表中的另一行重复,那么将忽...
参考官方文档https://support.microsoft.com/zh-cn/help/139444/how-to-remove-duplicate-rows-from-a-table-in-sql-serverlink 原文摘录 需要检查是否是除了id列之外的整行重复,请对比所有列之后,选择需要保留的行 只有几组重复的 PK 值(手动删除)
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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...