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synced 2025-05-28 13:01:26 +03:00
23 lines
576 B
Plaintext
23 lines
576 B
Plaintext
DROP DATABASE IF EXISTS mcs188_db;
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CREATE DATABASE mcs188_db;
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USE mcs188_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 AVG(DISTINCT a) FROM t1;
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AVG(DISTINCT a)
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4.1667
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SELECT AVG(DISTINCT a) FROM t1 GROUP BY b HAVING b = 'aaa';
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AVG(DISTINCT a)
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2.6667
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SELECT b, AVG(DISTINCT a) FROM t1 GROUP BY b ORDER BY b DESC;
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b AVG(DISTINCT a)
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eee 7.0000
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ddd 5.0000
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ccc 1.0000
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aaa 2.6667
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NULL NULL
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SELECT AVG(a) FROM t1;
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AVG(a)
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3.7143
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DROP DATABASE mcs188_db;
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