SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
        WHERE table_name = 'Teams'
        AND table_schema = DATABASE()
        AND index_name = 'idx_teams_name'
    ) > 0,
    'SELECT 1',
    'CREATE INDEX idx_teams_name ON Teams(Name);'
));

PREPARE createIndexIfNotExists FROM @preparedStatement;
EXECUTE createIndexIfNotExists;
DEALLOCATE PREPARE createIndexIfNotExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'Teams'
        AND table_schema = DATABASE()
        AND column_name = 'AllowOpenInvite'
    ) > 0,
    'ALTER TABLE Teams DROP COLUMN AllowOpenInvite;',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'Teams'
        AND table_schema = DATABASE()
        AND column_name = 'LastTeamIconUpdate'
    ) > 0,
    'ALTER TABLE Teams DROP COLUMN LastTeamIconUpdate;',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'Teams'
        AND table_schema = DATABASE()
        AND column_name = 'Description'
    ) > 0,
    'ALTER TABLE Teams DROP COLUMN Description;',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'Teams'
        AND table_schema = DATABASE()
        AND column_name = 'GroupConstrained'
    ) > 0,
    'ALTER TABLE Teams DROP COLUMN GroupConstrained;',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

DROP TABLE IF EXISTS Teams;