--将新表中的数据插入到旧表 insert test select from # --删除新表 drop table # --查看结果 select from test 查找表中多余的重复记录... group by peopleId having count(peopleId) > 1) 2、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid... by peopleId,seq having...
This method is a little different from the others, as we use several steps. We create a table to store the de-duplicated data, then update the main table with it. Here are the steps: Create a new table that has the same structure as the original table. Insert the distinct (de-duplica...
"expanded_query":"/* select#1 */ select `t_table_1`.`id` AS `id`,`t_table_1`.`task_id` AS `task_id` from `t_table_1` where <in_optimizer>(`t_table_1`.`task_id`,<exists>(/* select#2 */ select `t_table_2`.`id` from `t_table_2` where ((`t_table_2`.`uid` ...
ROW_NUMBER() OVER (PARTITION BY id, name, age ORDER BY id) AS Duplicates FROM Test ) DELETE FROM CTE WHERE Duplicates > 1 GO Now check the table to make sure duplicates are being removed from table. Related:
--Create a temporary database to store the necessary rows required to remove the duplicate data USE master GO IF EXISTS(SELECT 1 FROM sys.databases WHERE name = 'dbChangeTrackingMetadata') BEGIN DROP DATABASE dbChangeTrackingMetadata END GO CREATE DATABASE dbChangeTrackingMetadata GO...
Scan a subquery table using an index that enables a single value to be chosen from each subquery's value group. Materialize the subquery into an indexed temporary table that is used to perform a join, where the index is used to remove duplicates. The index might also be used later for lo...
Finally we got a single record of John at the end. Let us confirm by seeing the Customers1 table. select * from customers1 go Once done, we can drop the local temporary table. Scenario 2: Delete duplicate rows where primary key or unique key value is different but remaining values are ...
FROM mytable WHEREcondition(s)ORDERBY column ASC/DESC LIMIT num_limit OFFSET num_offset; 查询结果: 1.selectdistinct director from movies order by director asc; where语句可以不写,灵活使用 Since theDISTINCTkeyword will blindly remove duplicate rows, ...
The subpartitions inherit all their attributes from any attributes specified for the new partition, except for TABLESPACE, which you can specify at the subpartition level. Any attributes not specified at the subpartition or partition level are inherited from table-level defaults. ...
[Sql server 2012] Change from vertical to horizontal table as dynamic @@FETCH_STATUS in nested loops @@ServerName returns wrong value in SQL SERVER 2008 ##TempTable and INSERT-SELECT FROM an existing Table with an IDENTITY column %rowtype equivalent in SQL server ++ operator in TSQL - bug ...