Identifying duplicate rows It is possible to determine duplicate rows using the select with a count of all the rows which have the same values in the 'unique' fields as follows : select a,b,count(*) from test group by a,b having count(*) > 1; The above script will produce an output...
dup duplicate_indexes, i.uniqueness, i.partitioned, i.leaf_blocks, i.distinct_keys, i.num_rows, i.clustering_factor FROM (SELECT table_owner, table_name, index_owner, index_name, column_name_list_dup, dup, MAX(dup) OVER(PARTITION BY table_owner, table_name, index_name) dup_mx FROM ...
SQL>delete from cz a where a.rowid<(select max(rowid) from cz b where a.c1=b.c1 and a.c10=b.c10 and a.c20=b.c20); SQL>delete from cz a where rowid <(select max(rowid) from cz where c1=a.c1 and c10=a.c10 and c20=a.c20); (3).适用于有少量重复记录的情况(临时表法): ...
SQL>delete from cz a where a.rowid<(select max(rowid) from cz b where a.c1=b.c1 and a.c10=b.c10 and a.c20=b.c20); SQL>delete from cz a where rowid <(select max(rowid) from cz where c1=a.c1 and c10=a.c10 and c20=a.c20); (3).适用于有少量重复记录的情况(临时表法): ...
SYS@DGPHY1> select count(1) from lhr.test; COUNT(1) --- 1014 SYS@DGPHY1> 可以看到数据已经实时同步了,至此,物理备库搭建完成,至于备库的维护操作还有很多内容,参考我的其它blog。 实验总结 实验过程中需要注意的几项内容: 主库修改参数一定要加 sid='*' 监听必须配置好 执行duplicate命令的时候,如果...
select ID, json_value(json_field, '$.Code') from json_table where ID=390; select ID, json_value(json_field, '$.Time') from json_table where ID=390; 两条语句均只返回一条记录。 2 使用count(*)时,查询结果始终正确: create or replace view json_view as select ID, json_value(json_fie...
select seq_x.next_val into v_x from dual; 在11g中,不需要这么麻烦了,下面语句就可以实现: v_x := seq_x.next_val; PLSQL_Warning 11g中。可以通过设置PLSQL_Warning=enable all,如果在"when others"没有错误爆出就发警告信息。 ...
The button functions include: 3-12 Oracle Fusion Middleware User's Guide for Oracle Business Activity Monitoring Saving Reports â Group Sort and Value Suppress sorts by group and suppresses duplicate values from displaying. â Value Suppress suppresses duplicate values from displaying...
To find duplicate rows from thefruitstable, you first list the fruit name and color columns in bothSELECTandGROUP BYclauses. Then you count the number of appearances each combination appears with theCOUNT(*)function as shown below: SELECTfruit_name, color,COUNT(*)FROMfruitsGROUPBYfruit_name, ...
The selected rows are not locked; other users can view the same rows during the transaction. A user can update a row if the TIMESTAMP for the row is unchanged since the time of selection. Description: DISTINCT eliminates the duplicate rows. The INSERT INTO <table> SELECT FROM... construct...