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select * from `data_dictionary`.`INDEXES` where `TABLE_NAME` = NULL;
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TABLE_SCHEMA TABLE_NAME INDEX_NAME IS_USED_IN_PRIMARY IS_UNIQUE IS_NULLABLE KEY_LENGTH INDEX_TYPE INDEX_COMMENT
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select * from data_dictionary.schemas where schema_name = NULL;
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select * from data_dictionary.tables where table_schema = NULL;
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select * from data_dictionary.tables where table_name = NULL;
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# Test that the query is visible to self and others.