本文提供了一个脚本,可使用此脚本从 Microsoft SQL Server 表中删除重复行。 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 CREATETABLEoriginal_table (key_valueint)INSERT
The WHERE clause of the outer query uses a > ANY condition to check for duplicates. It will delete any row that has a rowid greater than at least one other row. This ensures that all but one of the rows that match your conditions is met, therefore removing all duplicates. So, how doe...
We want remove one of the duplicate records of John. By issuing the following summary query, we can see which see which records are duplicate. select * from customers1 Group by Custid,CustName, CustCity, Passport_Number Having count(*) > 1 Now we will add this row to a local temporary...
ROW_NUMBER WF enumerates the rows. We can also use it to remove duplicate records with it. Or to take a random sample. As the name suggests WF can calculate statistics on a given window: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 sum(sales)OVER(PARTITIONBYCustomerIDBYtsROWSBETWEEN...
"steps": [ { "expanded_query": "/* select#2 */ select `t_table_2`.`id` from `t_table_2` where (`t_table_2`.`uid` = 1)" }, { "transformation": { "select#": 2, "from": "IN (SELECT)", "to": "semijoin", "chosen": true } } ] "expanded_query": "/* select#1...
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. ...
"expanded_query":"/* select#2 */ select `t_table_2`.`id` from `t_table_2` where (`t_table_2`.`uid` = 1)" }, { "transformation": { "select#":2, "from":"IN (SELECT)", "to":"semijoin", "chosen":false } },
SQL_CALC_FOUND_ROWS SQL_NO_CACHE SQL_SMALL_RESULT SQL_THREAD SQL_TSI_DAY SQL_TSI_HOUR SQL_TSI_MINUTE SQL_TSI_MONTH SQL_TSI_QUARTER SQL_TSI_SECOND SQL_TSI_WEEK SQL_TSI_YEAR SSL STACKED START STARTING STARTS STATS_AUTO_RECALC STATS_PERSISTENT STATS_SAMPLE_PAGES STATUS STOP STORAGE STORED ST...
PWAIT_RESOURCE_SEMAPHORE_FT_PARALLEL_QUERY_SYNC 僅限內部使用。 適用於:SQL Server 2012 (11.x) 和更新版本。 PWAIT_SBS_FILE_OPERATION 僅限內部使用。 適用於:SQL Server 2017 (14.x) 和更新版本。 PWAIT_XTP_FSSTORAGE_MAINTENANCE 僅限內部使用。...
MULTIPLE_QUERY_RESULT_CLAUSES_WITH_PIPE_OPERATORS MUTUALLY_EXCLUSIVE_OPTIONS NAMESPACE_ALREADY_EXISTS NAMESPACE_NOT_EMPTY NAMESPACE_NOT_FOUND NON_PARTITION_COLUMN NOTEBOOK_NAME_LIMIT_REACHED NOTEBOOK_NOT_FOUND NOTIFICATIONS_DUPLICATE_ALERTS NOTIFICATIONS_DUPLICATE_EMAIL_ADDRESSES NOTIFICATIONS_INVALID_ALERTS ...