Now we have realized that custid 1, 4 & 5 are duplicate. The self-join statement accompanied by delete statement will give us the desired output of keeping the last duplicate record by eliminating all the previous duplicate records. We will use theCommon Table Expression (CTE)and put the Sel...
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...
FROM tbl_RemoveDuplicate) AS T WHERE T.RowNumber > 1); Check the result: 1 2 3 4 5 6 7 8 9 SELECT *FROM tbl_RemoveDuplicate; id | name ---+--- 1 | ABC 2 | XYZ 4 | RFQ 5 | PQR 6 | EFG (5 rows)SQL Puzzle: SQL Advance Query - Find the Order basis on thier Statu...
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...
If we look at the result set, we can easily understand thatBookNumber: 3andBookNumber: 4are duplicate rows. Previously, it was explained in detailhow to remove duplicates in SQL. We must delete them to keep the database consistent.
Write aSQLquerytodeleteallduplicate email entriesinatablenamed Person, keepingonlyuniqueemails basedonits smallest Id.+---+---+|Id|Email|+---+---+|1|john@example.com||2|bob@example.com||3|john@example.com|+---+---+Idistheprimarykeycolumnforthis table.Forexample, afterrunningyour quer...
开始我们拿sql到数据库查询平台查库执行计划,无奈这个平台有bug,delete语句无法查看,所以我们改成select,“应该”是一样。这个“应该”加了双引号,导致我们走了一点弯路。EXPLAIN SELECT * from t_table_1 where task_id in (select id from t_table_2 where uid = 1) explain后可以看到是走了索引的 到这里...
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Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. For example, after running your query, the above Person table should have the following rows: 查询结果 三、SQL 语句 3.1 网友答案 DELETE FROM Person WHERE Id...
开始我们拿sql到数据库查询平台查库执行计划,无奈这个平台有bug,delete语句无法查看,所以我们改成select,“应该”是一样。这个“应该”加了双引号,导致我们走了一点弯路。 EXPLAINSELECT*fromt_table_1wheretask_idin(selectidfromt_table_2whereuid=1)