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58 lines
1.4 KiB
Text
58 lines
1.4 KiB
Text
--echo #
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--echo # Try DENSE_RANK() function
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--echo #
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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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);
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insert into t1 values
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( 1 , 0, 10),
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( 2 , 0, 10),
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( 3 , 1, 10),
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( 4 , 1, 10),
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( 8 , 2, 10),
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( 5 , 2, 20),
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( 6 , 2, 20),
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( 7 , 2, 20),
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( 9 , 4, 20),
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(10 , 4, 20);
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select pk, a, b, rank() over (order by a) as rank,
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dense_rank() over (order by a) as dense_rank
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from t1;
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select pk, a, b, rank() over (partition by b order by a) as rank,
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dense_rank() over (partition by b order by a) as dense_rank
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from t1;
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drop table t1;
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--echo #
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--echo # Test with null values in the table.
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--echo #
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create table t2 (s1 int, s2 char(5));
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insert into t2 values (1,'a');
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insert into t2 values (null,null);
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insert into t2 values (1,null);
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insert into t2 values (null,'a');
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insert into t2 values (null,'c');
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insert into t2 values (2,'b');
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insert into t2 values (-1,'');
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select *, rank() over (order by s1) as rank,
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dense_rank() over (order by s1) as dense_rank
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from t2;
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select *, rank() over (partition by s2 order by s1) as rank,
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dense_rank() over (partition by s2 order by s1) as dense_rank
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from t2;
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select *, rank() over (order by s2) as rank,
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dense_rank() over (order by s2) as dense_rank
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from t2;
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select *, rank() over (partition by s1 order by s2) as rank,
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dense_rank() over (partition by s1 order by s2) as dense_rank
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from t2;
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drop table t2;
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