select_distinct.out

关系型数据库 Postgresql 6.5.2

QUERY: SELECT DISTINCT two FROM tmp;
two
---
  0
  1
(2 rows)

QUERY: SELECT DISTINCT ten FROM tmp;
ten
---
  0
  1
  2
  3
  4
  5
  6
  7
  8
  9
(10 rows)

QUERY: SELECT DISTINCT string4 FROM tmp;
string4
-------
AAAAxx 
HHHHxx 
OOOOxx 
VVVVxx 
(4 rows)

QUERY: SELECT DISTINCT two, string4, ten
   FROM tmp
   ORDER BY two using <, string4 using <, ten using <;
two|string4|ten
---+-------+---
  0|AAAAxx |  0
  0|AAAAxx |  2
  0|AAAAxx |  4
  0|AAAAxx |  6
  0|AAAAxx |  8
  0|HHHHxx |  0
  0|HHHHxx |  2
  0|HHHHxx |  4
  0|HHHHxx |  6
  0|HHHHxx |  8
  0|OOOOxx |  0
  0|OOOOxx |  2
  0|OOOOxx |  4
  0|OOOOxx |  6
  0|OOOOxx |  8
  0|VVVVxx |  0
  0|VVVVxx |  2
  0|VVVVxx |  4
  0|VVVVxx |  6
  0|VVVVxx |  8
  1|AAAAxx |  1
  1|AAAAxx |  3
  1|AAAAxx |  5
  1|AAAAxx |  7
  1|AAAAxx |  9
  1|HHHHxx |  1
  1|HHHHxx |  3
  1|HHHHxx |  5
  1|HHHHxx |  7
  1|HHHHxx |  9
  1|OOOOxx |  1
  1|OOOOxx |  3
  1|OOOOxx |  5
  1|OOOOxx |  7
  1|OOOOxx |  9
  1|VVVVxx |  1
  1|VVVVxx |  3
  1|VVVVxx |  5
  1|VVVVxx |  7
  1|VVVVxx |  9
(40 rows)

QUERY: SELECT DISTINCT p.age FROM person* p ORDER BY age using >;
age
---
 98
 88
 78
 68
 60
 58
 50
 48
 40
 38
 34
 30
 28
 25
 24
 23
 20
 19
 18
  8
(20 rows)