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58 lines
2 KiB
Text
58 lines
2 KiB
Text
create table t1 (
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pk int primary key,
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a int,
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b int,
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c char(10),
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d decimal(10, 3),
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e real
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);
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insert into t1 values
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( 1, 0, 1, 'one', 0.1, 0.001),
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( 2, 0, 2, 'two', 0.2, 0.002),
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( 3, 0, 3, 'three', 0.3, 0.003),
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( 4, 1, 2, 'three', 0.4, 0.004),
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( 5, 1, 1, 'two', 0.5, 0.005),
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( 6, 1, 1, 'one', 0.6, 0.006),
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( 7, 2, NULL, 'n_one', 0.5, 0.007),
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( 8, 2, 1, 'n_two', NULL, 0.008),
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( 9, 2, 2, NULL, 0.7, 0.009),
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(10, 2, 0, 'n_four', 0.8, 0.010),
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(11, 2, 10, NULL, 0.9, NULL);
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select pk, first_value(pk) over (order by pk),
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last_value(pk) over (order by pk),
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first_value(pk) over (order by pk desc),
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last_value(pk) over (order by pk desc)
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from t1
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order by pk desc;
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select pk,
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first_value(pk) over (order by pk
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RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
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last_value(pk) over (order by pk
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RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
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first_value(pk) over (order by pk desc
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RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
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last_value(pk) over (order by pk desc
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RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
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from t1
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order by pk;
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select pk,
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first_value(pk) over (order by pk desc),
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last_value(pk) over (order by pk desc)
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from t1;
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select pk, a, b, c, d, e,
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first_value(b) over (partition by a order by pk) as fst_b,
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last_value(b) over (partition by a order by pk) as lst_b,
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first_value(c) over (partition by a order by pk) as fst_c,
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last_value(c) over (partition by a order by pk) as lst_c,
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first_value(d) over (partition by a order by pk) as fst_d,
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last_value(d) over (partition by a order by pk) as lst_d,
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first_value(e) over (partition by a order by pk) as fst_e,
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last_value(e) over (partition by a order by pk) as lst_e
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from t1;
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drop table t1;
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