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23 lines
544 B
Plaintext
23 lines
544 B
Plaintext
DROP DATABASE IF EXISTS mcs189_db;
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CREATE DATABASE mcs189_db;
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USE mcs189_db;
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CREATE TABLE t1 (a INT, b CHAR(5))ENGINE=Columnstore;
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INSERT INTO t1 VALUES (NULL, ''),(1, 'aaa'),(2, 'aaa'),(1, 'ccc'),(4, 'ddd'),(5, 'aaa'),(6, 'ddd'),(7, 'eee');
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SELECT SUM(DISTINCT a) FROM t1;
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SUM(DISTINCT a)
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25
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SELECT SUM(DISTINCT a) FROM t1 GROUP BY b HAVING b = 'aaa';
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SUM(DISTINCT a)
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8
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SELECT b, SUM(DISTINCT a) FROM t1 GROUP BY b ORDER BY b DESC;
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b SUM(DISTINCT a)
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eee 7
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ddd 10
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ccc 1
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aaa 8
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NULL NULL
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SELECT SUM(a) FROM t1;
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SUM(a)
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26
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DROP DATABASE mcs189_db;
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