详解Oracle12CFETCH FIRST语法及功能

 语法:

1、不包含相同结果

     FETCH FIRST 10 PERCENT ROWS ONLY

2、包含相同结果

     FETCH FIRST 10 PERCENT ROWS WITH TIES

Connected to Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 
Connected as [email protected]:1521/ncbtcrmpdb

SQL>  --查询IFS_EPCUST_VALUE_INFO表数据总量
SQL> select count(*) from IFS_EPCUST_VALUE_INFO; 
  COUNT(*)
----------
     36520

SQL> --查询活期金额最少的前10%的行,包括金额相同的行
SQL> select count(*) from(select * from IFS_EPCUST_VALUE_INFO order by current_bal fetch first 10 percent rows with TIES);
  COUNT(*)
----------
     27594

SQL> --查询活期金额等于0的行数
SQL> select count(*) from IFS_EPCUST_VALUE_INFO where current_bal=0;
  COUNT(*)
----------
     27594

SQL> --查询活期金额最少的前10%的行,不包括金额相同的行
SQL> select count(*) from( select * from IFS_EPCUST_VALUE_INFO order by current_bal fetch first 10 percent rows only);
  COUNT(*)
----------
      3652

SQL> --查询活期金额最大的前10行,不包括金额相同的行
SQL> select count(*) from( select * from IFS_EPCUST_VALUE_INFO order by  current_bal desc  fetch first 10  rows only);
  COUNT(*)
----------
        10

SQL>  --查询活期金额最小的前10行,包括金额相同的行
SQL> select count(*) from( select * from IFS_EPCUST_VALUE_INFO order by  current_bal  fetch first 10  rows with TIES);
  COUNT(*)
----------
     27594

SQL> 

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转载自blog.csdn.net/makai5521/article/details/89454463