45 строки
1.2 KiB
SQL
45 строки
1.2 KiB
SQL
SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
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WHERE table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND column_name = 'MsgCountRoot'
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) > 0,
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'ALTER TABLE ChannelMembers DROP COLUMN MsgCountRoot;',
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'SELECT 1'
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));
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PREPARE alterIfExists FROM @preparedStatement;
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EXECUTE alterIfExists;
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DEALLOCATE PREPARE alterIfExists;
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SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
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WHERE table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND column_name = 'MentionCountRoot'
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) > 0,
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'ALTER TABLE ChannelMembers DROP COLUMN MentionCountRoot;',
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'SELECT 1'
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));
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PREPARE alterIfExists FROM @preparedStatement;
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EXECUTE alterIfExists;
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DEALLOCATE PREPARE alterIfExists;
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SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
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WHERE table_name = 'Channels'
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AND table_schema = DATABASE()
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AND column_name = 'TotalMsgCountRoot'
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) > 0,
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'ALTER TABLE Channels DROP COLUMN TotalMsgCountRoot;',
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'SELECT 1'
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));
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PREPARE alterIfExists FROM @preparedStatement;
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EXECUTE alterIfExists;
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DEALLOCATE PREPARE alterIfExists;
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