Select from another select statement : Multiple Row Subquery « Query Select « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Query Select » Multiple Row Subquery 
2. 38. 9. Select from another select statement
SQL> create table t
  2  (item number,
  3   bin number,
  4   primary key (bin , item) );

Table created.

SQL>
SQL> insert into t values(234353);

row created.

SQL> insert into t values(45,34353);

row created.

SQL> insert into t values(76,34353);

row created.

SQL> insert into t values(76,35667);

row created.

SQL> insert into t values(89,35667);

row created.

SQL> insert into t values(45,35667);

row created.

SQL> insert into t values(45,36767);

row created.

SQL>
SQL> insert into t values(46,36767);

row created.

SQL> insert into t values(66,36767);

row created.

SQL> insert into t values(86,36767);

row created.

SQL> insert into t values(96,36767);

row created.

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

      ITEM        BIN
---------- ----------
         2      34353
        45      34353
        45      35667
        45      36767
        46      36767
        66      36767
        76      34353
        76      35667
        86      36767
        89      35667
        96      36767

11 rows selected.

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  /

       BIN   COUNT(*COUNT(*)/CNT
---------- ---------- ------------
     35667          3          .75
     36767          1          .25
     34353          3          .75

SQL>
SQL> drop table t;

Table dropped.

SQL>
SQL>
2. 38. Multiple Row Subquery
2. 38. 1. Writing Multiple Row Subqueries
2. 38. 2. Using IN with a Multiple Row Subquery
2. 38. 3. Update price of products that aren't selling
2. 38. 4. Multi-row subqueries: Show products that aren't selling
2. 38. 5. Uses NOT IN to check if an id is not in the list of id values in the employee table
2. 38. 6. Using ANY with a Multiple Row Subquery
2. 38. 7. Using ALL with a Multiple Row Subquery
2. 38. 8. Writing Multiple Column Subqueries
2. 38. 9. Select from another select statement
2. 38. 10. Subqueries That Return Multiple Results
2. 38. 11. First three rows from subquery
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