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