81 lines
2.3 KiB
SQL
81 lines
2.3 KiB
SQL
--
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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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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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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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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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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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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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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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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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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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-- 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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--
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-- Test behavior of volatile and set-returning functions in conjunction
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-- with ORDER BY and LIMIT.
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--
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create temp sequence testseq;
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explain (verbose, costs off)
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select unique1, unique2, nextval('testseq')
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from tenk1 order by unique2 limit 10;
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select unique1, unique2, nextval('testseq')
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from tenk1 order by unique2 limit 10;
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select currval('testseq');
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explain (verbose, costs off)
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select unique1, unique2, nextval('testseq')
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from tenk1 order by tenthous limit 10;
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select unique1, unique2, nextval('testseq')
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from tenk1 order by tenthous limit 10;
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select currval('testseq');
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explain (verbose, costs off)
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select unique1, unique2, generate_series(1,10)
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from tenk1 order by unique2 limit 7;
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select unique1, unique2, generate_series(1,10)
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from tenk1 order by unique2 limit 7;
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explain (verbose, costs off)
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select unique1, unique2, generate_series(1,10)
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from tenk1 order by tenthous limit 7;
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select unique1, unique2, generate_series(1,10)
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from tenk1 order by tenthous limit 7;
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