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Query and delete duplicate records of SQL statement 1, find redundant records in the table, duplicate records are based on a single field (ID) to determine the select * from table where Id in (the Select ID from table group Byid having count (ID) > 1

1. Use logical operation symbolsQuestion: Query for wages higher than 500 or job manager employees, but also to meet their initials in uppercase J?SELECT * from emp where (Sal > $ or job = ' MANAGER ') and ename like ' j% ';2. Use the ORDER BY

SQL statement for querying and deleting duplicate records1, look for redundant records in the table, duplicate records are based on a single field (ID) to determineselect * FROM table where Id in (select ID from table group Byid have count (Id) > 1) 

1, the query table duplicate data. SELECT * from Peoplewhere Peopleid in (select Peopleid from People GROUP by Peopleid have count (Peopleid) > 1)2, delete redundant records in the table, duplicate records are based on a single field (Peopleid) to

SQL statements for querying and deleting duplicate records   reprinted from: HTTP://WWW.CNBLOGS.COM/252E/ARCHIVE/2012/09/13/2682817.HTML1, redundant duplicate records in lookup tables, Duplicate records are based on a single field (ID) to determine  

Subquery: Type, syntax, and considerationsWhat problems can be solved by using subqueries?650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M02/8E/A4/wKioL1jHqvaAi5l5AABtYPakz2M348.jpg "title=" Qq20170314135459.jpg "alt="

In thousands of records, there are some same records, how can you use SQL statements, delete duplicates1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from Peoplewhere

SQL row-to-column and column-changing careersThe ranks of each other, is a frequently encountered demand. The implementation method is implemented with case-when mode and a built-in pivot and Unpivot method after 2005.After reading the technical

--1 CREATE VIEW Show_max_sal_name_view display the highest wage employee name and his salary create or replace view Show_max_sal_name_view asselect Ename,sal from SC Ott.emp where sal= (select Max (sal) from scott.emp), select * from

Turn from Hibiscus bloghttp://blog.sina.com.cn/liurongxiu1211 SQL to remove duplicate statements(2012-06-15 15:00:01)SQL single table/multi-table query removes duplicate recordsSingle table DistinctMulti-table GROUP byGroup by must be placed before

Query and delete duplicate records of SQL statement 1, find redundant records in the table, duplicate records are based on a single field (ID) to determineSelect * from where inch (selectfromgroupby hascount>1 )2, delete redundant records in the

1. Use logical operation symbolsQuestion: Query for wages higher than 500 or job manager employees, but also to meet their initials in uppercase J?SELECT * from emp where (Sal > $ or job = ' MANAGER ') and ename like ' j% ';2. Use the ORDER BY

1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from Peoplewhere Peopleid in (select Peopleid from People GROUP by Peopleid have count(Peopleid) > 1)2, delete redundant

1: Common functionsTo_date () function to convert a string to a date formatSelect To_date (' 2015-09-12 ', ' YYYY-MM-DD ') from dual; --The subsequent date format to match the previous conversionTo_number () function to convert a string to a number

Query and delete duplicate records of the SQL statement  1, find redundant records in the table, duplicate records are based on a single field (ID) to determine the  select * from table where Id in (select ID from table group Byid have COUNT (ID) > 1

With SQL statements, delete duplicates only keep one In thousands of records, there are some same records, how can you use SQL statements, delete duplicates1, look for redundant records in the table, duplicate records

Duplicate data query and delete operations in Oracle--1. Duplicate records of Username= ' Lingjie ' in the query tableSelect Userid,username from NMB where username in (Select username from NMB GROUP by username have count (username) >1)--2. Delete

Reprint Please specify: theviper http://www.cnblogs.com/TheViperPartially translated from How to select the First/least/max row per group in SQLSome common SQL problems have similar workarounds, such as finding the most recent logs for each program,

1, the query table duplicate data. SELECT * from Peoplewhere Peopleid in (select Peopleid from People GROUP by Peopleid have count (Peopleid) > 1)2, delete redundant records in the table, duplicate records are based on a single field (Peopleid) to

1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from Peoplewhere Peopleid in (select Peopleid from People GROUP by Peopleid have count (Peopleid) > 1)Example two: SELECT *