+[DB2](https://www.ibm.com/support/knowledgecenter/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0059224.html), [ClickHouse](https://clickhouse.tech/docs/zh/sql-reference/syntax/), [OceanBase](https://www.oceanbase.com/docs/oceanbase/V2.2.50/ss-sr-select_daur3l), [Presto](https://prestodb.io/docs/current/admin/function-namespace-managers.html), [Spark](http://spark.apache.org/sql/), [Hive](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select)(延伸支持 Hadoop, Spark), [Phoenix](http://phoenix.apache.org/language/index.html#select)(延伸支持 HBase)
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