FROM clause
The FROM clause specifies the table or tables from which to retrieve data. <table reference> can be a single table, a comma-delimited list of tables, or can be an inner or outer join as specified in the SQL-92 standard. For example, the following statement specifies a single table:
SELECT PART_NO FROM PARTS
The next statement specifies a left outer join for table_reference:
SELECT * FROM PARTS LEFT OUTER JOIN INVENTORY ;
ON PARTS.PART_NO = INVENTORY.PART_NO