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https://github.com/MariaDB/server.git
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87 lines
3.2 KiB
Text
87 lines
3.2 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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--echo #
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--echo # MDEV-11746: Wrong result upon using FIRST_VALUE with a window frame
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--echo #
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create table t1 (i int);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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select i,
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first_value(i) OVER (order by i rows between CURRENT ROW and 1 FOLLOWING) as fst_1f,
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last_value(i) OVER (order by i rows between CURRENT ROW and 1 FOLLOWING) as last_1f,
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first_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
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last_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
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first_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
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last_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
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first_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f,
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last_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f
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from t1;
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drop table t1;
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--echo #
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--echo # MDEV-12861 FIRST_VALUE() does not preserve the exact data type
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--echo #
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CREATE TABLE t1 (a INT, b INT, c FLOAT);
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INSERT INTO t1 VALUES (1,1,1),(1,2,2),(2,1,1),(2,2,2);
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CREATE TABLE t2 AS SELECT a, FIRST_VALUE(b) OVER(), FIRST_VALUE(c) OVER() FROM t1 GROUP BY a;
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SHOW CREATE TABLE t2;
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DROP TABLE t2,t1;
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