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...
SELECTf.*,COUNT(*)OVER(PARTITIONBYfruit_name, color) cFROMfruits f;Code language:SQL (Structured Query Language)(sql) In this query, we added anOVER()clause after theCOUNT(*)and placed a list of columns, which we checked for duplicate values, after a partition by clause. The partition ...
或者通过 lsnrctl status 也可以查看位置 这里展示的是xml格式的日志,跟.log并无区别。 或者11g可以通过 adrci 命令 代码语言:javascript 代码运行次数:0 运行 AI代码解释 oracle@entel2:[/oracle]$adrciADRCI:Release11.2.0.4.0-Production on Wed Nov3020:56:282016Copyright(c)1982,2011,Oracle and/or its aff...
createtabletest(mcvarchar2(60));insertintotestvalues('112233445566778899');insertintotestvalues('22113344 5566778899');insertintotestvalues('33112244 5566778899');insertintotestvalues('44112233 5566 778899');insertintotestvalues('5511 2233 4466778899');insertintotestvalues('661122334455778899');insertintotes...
insert into TEST (MC) values ('abcxy'); insert into TEST (MC) values ('The final test is is is how to find duplicate words.'); commit; select 1,'^[:digit:]',mc from test where regexp_like(mc,'^[:digit:]')--以':digit'中的任何一个字符开头的字符串 union select 2,'[^[:...
insert into test values('123xy'); insert into test values('007ab'); insert into test values('abcxy'); insert into test values('The final test is is is how to find duplicate words.'); commit; 一、REGEXP_LIKE select * from test where regexp_like(mc,'^a{1,3}'); ...
17 How to find the tablespace of a table? 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 ...
insert into tab1 (id,name) select id,name_2 from tab2 on duplicate key update = tab2.name_2; 以上的一条语句就可以完成这个工作,根据主键或者唯一索引,来判断重复的数据,并紧紧进行更新,否则就插入tab1中在tab2中不存在的数据。 对比SQL SERVER , MySQL在这项工作中显然是要方便的多。
â Value Suppress suppresses duplicate values from displaying more than once. â Sort Ascending sorts the column in ascending order. â Sort Descending sorts the column in descending order. â Group adds a group header and footer for the column. â ...
suppressing the display of duplicate values for a given column skipping a line each time a given column value changes printing computed figures each time a given column value changes or at the end of the report Enter BREAK with no clauses to list the current BREAK definition. Where report...