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|
--
-- LIMIT
-- Check the LIMIT/OFFSET feature of SELECT
--
SELECT ''::text AS two, unique1, unique2, stringu1
FROM onek WHERE unique1 > 50
ORDER BY unique1 LIMIT 2;
two | unique1 | unique2 | stringu1
-----+---------+---------+----------
| 51 | 76 | ZBAAAA
| 52 | 985 | ACAAAA
(2 rows)
SELECT ''::text AS five, unique1, unique2, stringu1
FROM onek WHERE unique1 > 60
ORDER BY unique1 LIMIT 5;
five | unique1 | unique2 | stringu1
------+---------+---------+----------
| 61 | 560 | JCAAAA
| 62 | 633 | KCAAAA
| 63 | 296 | LCAAAA
| 64 | 479 | MCAAAA
| 65 | 64 | NCAAAA
(5 rows)
SELECT ''::text AS two, unique1, unique2, stringu1
FROM onek WHERE unique1 > 60 AND unique1 < 63
ORDER BY unique1 LIMIT 5;
two | unique1 | unique2 | stringu1
-----+---------+---------+----------
| 61 | 560 | JCAAAA
| 62 | 633 | KCAAAA
(2 rows)
SELECT ''::text AS three, unique1, unique2, stringu1
FROM onek WHERE unique1 > 100
ORDER BY unique1 LIMIT 3 OFFSET 20;
three | unique1 | unique2 | stringu1
-------+---------+---------+----------
| 121 | 700 | REAAAA
| 122 | 519 | SEAAAA
| 123 | 777 | TEAAAA
(3 rows)
SELECT ''::text AS zero, unique1, unique2, stringu1
FROM onek WHERE unique1 < 50
ORDER BY unique1 DESC LIMIT 8 OFFSET 99;
zero | unique1 | unique2 | stringu1
------+---------+---------+----------
(0 rows)
SELECT ''::text AS eleven, unique1, unique2, stringu1
FROM onek WHERE unique1 < 50
ORDER BY unique1 DESC LIMIT 20 OFFSET 39;
eleven | unique1 | unique2 | stringu1
--------+---------+---------+----------
| 10 | 520 | KAAAAA
| 9 | 49 | JAAAAA
| 8 | 653 | IAAAAA
| 7 | 647 | HAAAAA
| 6 | 978 | GAAAAA
| 5 | 541 | FAAAAA
| 4 | 833 | EAAAAA
| 3 | 431 | DAAAAA
| 2 | 326 | CAAAAA
| 1 | 214 | BAAAAA
| 0 | 998 | AAAAAA
(11 rows)
SELECT ''::text AS ten, unique1, unique2, stringu1
FROM onek
ORDER BY unique1 OFFSET 990;
ten | unique1 | unique2 | stringu1
-----+---------+---------+----------
| 990 | 369 | CMAAAA
| 991 | 426 | DMAAAA
| 992 | 363 | EMAAAA
| 993 | 661 | FMAAAA
| 994 | 695 | GMAAAA
| 995 | 144 | HMAAAA
| 996 | 258 | IMAAAA
| 997 | 21 | JMAAAA
| 998 | 549 | KMAAAA
| 999 | 152 | LMAAAA
(10 rows)
SELECT ''::text AS five, unique1, unique2, stringu1
FROM onek
ORDER BY unique1 OFFSET 990 LIMIT 5;
five | unique1 | unique2 | stringu1
------+---------+---------+----------
| 990 | 369 | CMAAAA
| 991 | 426 | DMAAAA
| 992 | 363 | EMAAAA
| 993 | 661 | FMAAAA
| 994 | 695 | GMAAAA
(5 rows)
SELECT ''::text AS five, unique1, unique2, stringu1
FROM onek
ORDER BY unique1 LIMIT 5 OFFSET 900;
five | unique1 | unique2 | stringu1
------+---------+---------+----------
| 900 | 913 | QIAAAA
| 901 | 931 | RIAAAA
| 902 | 702 | SIAAAA
| 903 | 641 | TIAAAA
| 904 | 793 | UIAAAA
(5 rows)
-- Stress test for variable LIMIT in conjunction with bounded-heap sorting
SELECT
(SELECT n
FROM (VALUES (1)) AS x,
(SELECT n FROM generate_series(1,10) AS n
ORDER BY n LIMIT 1 OFFSET s-1) AS y) AS z
FROM generate_series(1,10) AS s;
z
----
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(10 rows)
|
