Oracle中处理duplicate的SQL技巧 在Oracle中处理重复数据的SQL技巧有以下几种方法: 使用DISTINCT关键字:可以通过在SELECT语句中使用DISTINCT关键字来去除重复的数据行。 SELECTDISTINCTcolumn1, column2FROMtable_name; 使用ROW_NUMBER()函数和Common Table Expressions(CTE):可以使用ROW_NUMBER()函数和CTE来为数据行添加行...
Now, we have all duplicate rows displayed in the result set. Finding duplicate records using analytic function# See the following query: SELECTf.*,COUNT(*)OVER(PARTITIONBYfruit_name, color) cFROMfruits f;Code language:SQL (Structured Query Language)(sql) In this query, we added anOVER()cla...
If you need to remove duplicate rows from an Oracle Database Table, you can use different approaches. For example, you can use the DELETE command with a criteria that selects only duplicates. Usually it is faster to create a new table with distinct rows and replace the old table with the...
SQL>altertableczaddconstraint cz_uniqueunique(c1,c10,c20) exceptionsintoexceptions; * ERROR at line1: ORA-02299: cannot validate (TEST.CZ_UNIQUE)-duplicate keys found SQL>createtabledupsasselect *fromczwhererowidin(selectrow_idfromexceptions); Tablecreated....
(从库的redolog文件是第7步duplicate指令由主库复制过来的) SQL> select member from v$logfile; MEMBER --- /u01/oracle/tools/oracle11g/oradata/orcl/redo03.log /u01/oracle/tools/oracle11g/oradata/orcl/redo02.log /u01/oracle/tools/oracle11g/oradata/orcl/redo01.log 1. 2. 3. 4. 5. 6. ...
SELECT tablespace_name FROM all_tables WHERE table_name = 'YOURTABLENAME'; 18 How to remove duplicate rows from a table If the unique/primary keys can be identified from the table, it is easier to remove the records from the table using the following query: DELETE FROM tablename WHERE row...
{part_func_type:0, part_func_expr:"", part_num:0, auto_part:false, auto_part_size:0}, partition_num:0, def_subpartition_num:0, partition_array:null, def_subpartition_array:null, hidden_partition_array:null, index_status:1, duplicate_scope:0, encryption:"", encrypt_key:"", master_...
数据库sqllinuxoracle访问管理 最近准备给一个生产项目上oracle 11g DataGuard,主备均为oracle 11.2.0.4软件,并在备库安装软件。这篇不讲述 DataGuard 的原理,只是oracle 11g DataGuard 搭建的详细过程。这次是生产库的RAC需要做一个DG,由于不知道SYS 用户密码,需要取回密码太麻烦,故不能使用 duplicate 方式,使用rma...
20 rows selected. 1.查找重复记录的几种方法: (1).SQL>select * from cz group by c1,c10,c20 having count(*) >1; C1 C10 C20 --- --- --- 1 2 dsf 2 3 che 3 4 dff (2).SQL>select distinct * from cz; C1 C10 C20 --- --...
Why are you getting duplicate rows? What action you want to take when you try to insert them? If the source data are clean, but you may be re-inserting existing values then changing your SQL is the way to go. The most straightforward is to add anot existsclause. Or if you want to...