update sql_reference.md (#129)
update sql_reference.md (#129)

* fix escape character in like predicate

* multi tenant doc

* modify error prompt when insert

* update sql_reference.md

imay/palo,lingbin/palo,cyongli/palo,imay/palo,imay/palo,morningman/palo,lingbin/palo,cyongli/palo,cyongli/palo,morningman/palo,lingbin/palo,morningman/palo,cyongli/palo,imay/palo,morningman/palo,lingbin/palo,lingbin/palo,imay/palo,lingbin/palo,imay/palo,cyongli/palo,morningman/palo,cyongli/palo,morningman/palo