inline view: What percentage of these items exist in each bin selected : Subquery Basics « Subquery « Oracle PL / SQL

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Oracle PL / SQL » Subquery » Subquery Basics 
inline view: What percentage of these items exist in each bin selected
    
SQL>
SQL> create table t
  2  (item number,
  3   bin number,
  4   primary key (bin , item) );

Table created.

SQL>
SQL> insert into t values(234);

row created.

SQL> insert into t values(45,34);

row created.

SQL> insert into t values(76,34);

row created.

SQL> insert into t values(76,35);

row created.

SQL> insert into t values(89,35);

row created.

SQL> insert into t values(45,35);

row created.

SQL> insert into t values(45,36);

row created.

SQL>
SQL> select from t
  2  order by 1,2;

         2         34
        45         34
        45         35
        45         36
        76         34
        76         35
        89         35

rows selected.

SQL>
SQL> 
SQL> select bin, count(*), count(*)/cnt
  2  from (
  3         select bin, count(distinct itemover () AS cnt
  4         from t
  5         where item in (2,45,76,89) )
  6  group by bin, cnt
  7  /

        34          3          .75
        35          3          .75
        36          1          .25

rows selected.

SQL> drop table t;

Table dropped.

SQL>

   
    
    
    
  
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