FROM { < table_source > } [ ,...n ]
<table_source>::=
<Expression | THISGROUP|INFOTABLE 基本面表ID |
{
<MARKETTABLE | TRADETABLE>
[DateKey BegTime TO EndTime]
[OF <StockID|StockIDArray>]
}|{<SQLTABLE | HUGESQLTABLE [KEEPNULL]><SQL_Str><OF SQL_Alias>}>
| <joined_table>

< joined_table > ::=< table_source >< join_type >< table_source >< ONWithExp >| < table_source > CROSS JOIN < table_source >| < joined_table >

< join_type > ::=[{ LEFT | RIGHT | FULL } ]JOIN

< ONWithExp > ::=
{ON < search_condition >} | { WITH (Expression[,...n] ON Expression[,...n]) }