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16 lines
378 B
Plaintext
16 lines
378 B
Plaintext
DROP DATABASE IF EXISTS mcs115_db;
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CREATE DATABASE mcs115_db;
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USE mcs115_db;
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CREATE TABLE t1 (a INT, b CHAR(1))ENGINE=Columnstore;
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INSERT INTO t1 VALUES(NULL, ''),(1, 'z'),(2, 'y'),(1, 'y'),(2, 'z'),(3, 'z');
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SELECT COUNT(a) FROM t1;
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COUNT(a)
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5
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SELECT COUNT(DISTINCT a) FROM t1;
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COUNT(DISTINCT a)
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3
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SELECT COUNT(DISTINCT b) FROM t1;
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COUNT(DISTINCT b)
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2
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DROP DATABASE mcs115_db;
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