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46 lines
1.7 KiB
Plaintext
46 lines
1.7 KiB
Plaintext
USE tpch1;
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drop table if exists testnulldate;
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create table testnulldate (id int, time_stamp datetime) engine=columnstore;
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insert into testnulldate values (1, '2010-11-08 17:46:44');
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insert into testnulldate values (2, null);
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insert into testnulldate values (3, SUBDATE('2010-11-08 17:46:44', 1));
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select
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id,
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`time_stamp`,
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DATE(`time_stamp`) as `Date`,
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case when `time_stamp` is null then 'N/A' else DATE(`time_stamp`) end as
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`Test1`,
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ifnull((DATE(`time_stamp`)),'N/A') as `Test2`,
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if(`time_stamp` is null, 'N/A', DATE(`time_stamp`)) as `Test3`,
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if(`time_stamp`<='2010-11-08 17:46:44',DATE(`time_stamp`),'N/A') as `Test4`,
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if(`time_stamp`<='2010-11-08 17:46:44',DATE(`time_stamp`),DATE('2010-11-08 17:46:44')) as `Test5`
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from testnulldate;
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id time_stamp Date Test1 Test2 Test3 Test4 Test5
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1 2010-11-08 17:46:44 2010-11-08 2010-11-08 2010-11-08 2010-11-08 2010-11-08 2010-11-08
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2 NULL NULL N/A N/A N/A N/A 2010-11-08
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3 2010-11-07 17:46:44 2010-11-07 2010-11-07 2010-11-07 2010-11-07 2010-11-07 2010-11-07
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select
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id,
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`time_stamp`,
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YEAR(`time_stamp`) as `Date`,
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case when `time_stamp` is null then 'N/A' else YEAR(`time_stamp`) end as
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`Test1`,
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ifnull((YEAR(`time_stamp`)),'N/A') as `Test2`,
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if(`time_stamp` is null, 'N/A', YEAR(`time_stamp`)) as `Test3`,
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if(`time_stamp`<='2010-11-08 17:46:44',YEAR(`time_stamp`),'N/A') as `Test4`,
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if(`time_stamp`<='2010-11-08 17:46:44',YEAR(`time_stamp`),DATE('2010-11-08 17:46:44')) as `Test5`
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from testnulldate;
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id time_stamp Date Test1 Test2 Test3 Test4 Test5
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1 2010-11-08 17:46:44 2010 2010 2010 2010 2010 2010
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2 NULL NULL N/A N/A N/A N/A 2010-11-08
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3 2010-11-07 17:46:44 2010 2010 2010 2010 2010 2010
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select
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id,
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case when `time_stamp` is null then 'N/A' end as `Test1`
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from testnulldate;
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id Test1
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1 NULL
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2 N/A
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3 NULL
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drop table if exists testnulldate;
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