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17 lines
446 B
MySQL
17 lines
446 B
MySQL
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1
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(
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date Date,
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s1 String,
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s2 String
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) ENGINE = MergeTree() PARTITION BY toYYYYMMDD(date) ORDER BY (date, s1)
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SETTINGS index_granularity = 8192;
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insert into t1 (date, s1,s2) values(today()-1,'aaa','bbb');
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alter table t1 add column s3 String DEFAULT concat(s2,'_',s1);
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insert into t1 (date, s1,s2) values(today(),'aaa2','bbb2');
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select ignore(date), s3 from t1 where s2='bbb';
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DROP TABLE t1;
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