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78 lines
2.5 KiB
SQL
78 lines
2.5 KiB
SQL
CREATE DATABASE IF NOT EXISTS test;
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DROP TABLE IF EXISTS test.check_query_comment_column;
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CREATE TABLE test.check_query_comment_column
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(
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first_column UInt8 DEFAULT 1 COMMENT 'first comment',
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second_column UInt8 MATERIALIZED first_column COMMENT 'second comment',
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third_column UInt8 ALIAS second_column COMMENT 'third comment',
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fourth_column UInt8 COMMENT 'fourth comment',
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fifth_column UInt8
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) ENGINE = TinyLog;
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SHOW CREATE TABLE test.check_query_comment_column;
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SELECT table, name, comment
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FROM system.columns
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WHERE table = 'check_query_comment_column' AND database = 'test'
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FORMAT PrettyCompactNoEscapes;
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ALTER TABLE test.check_query_comment_column
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COMMENT COLUMN first_column 'another first column',
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COMMENT COLUMN second_column 'another second column',
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COMMENT COLUMN third_column 'another third column',
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COMMENT COLUMN fourth_column 'another fourth column',
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COMMENT COLUMN fifth_column 'another fifth column';
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SHOW CREATE TABLE test.check_query_comment_column;
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SELECT table, name, comment
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FROM system.columns
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WHERE table = 'check_query_comment_column' AND database = 'test'
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FORMAT PrettyCompactNoEscapes;
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DROP TABLE IF EXISTS test.check_query_comment_column;
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CREATE TABLE test.check_query_comment_column
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(
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first_column Date COMMENT 'first comment',
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second_column UInt8 COMMENT 'second comment',
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third_column UInt8 COMMENT 'third comment'
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) ENGINE = MergeTree(first_column, (second_column, second_column), 8192);
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SHOW CREATE TABLE test.check_query_comment_column;
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SELECT table, name, comment
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FROM system.columns
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WHERE table = 'check_query_comment_column' AND database = 'test'
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FORMAT PrettyCompactNoEscapes;
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ALTER TABLE test.check_query_comment_column
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COMMENT COLUMN first_column 'another first comment',
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COMMENT COLUMN second_column 'another second comment',
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COMMENT COLUMN third_column 'another third comment';
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SHOW CREATE TABLE test.check_query_comment_column;
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SELECT table, name, comment
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FROM system.columns
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WHERE table = 'check_query_comment_column' and database = 'test'
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FORMAT PrettyCompactNoEscapes;
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DROP TABLE IF test.check_query_comment_column;
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CREATE TABLE test.check_query_comment_column
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(
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first_column UInt8 COMMENT 'first comment'
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) ENGINE = TinyLog;
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ALTER TABLE test.check_query_comment_column MODIFY COLUMN first_column COMMENT 'another comment';
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SELECT table, name, comment
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FROM system.columns
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WHERE table = 'check_query_comment_column' and database = 'test'
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FORMAT PrettyCompactNoEscapes;
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DROP TABLE IF EXISTS test.check_query_comment_column;
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