select语句提示有语法错误,怎么改呢?
SELECT "yxms"."dd"."dd_no", "yxms"."dd"."dd_date",
"yxms"."dd"."kehu_no",
"yxms"."kehu"."kehu_name",
"yxms"."dd"."product_no",
"yxms"."product"."product_name",
"yxms"."dd"."product_number",
"yxms"."dd"."dd_flag"
FROM "yxms"."dd",
"yxms"."kehu",
"yxms"."product"
WHERE ( "yxms"."dd"."kehu_no" = "yxms"."kehu"."kehu_no" ) and
( "yxms"."dd"."product_no" = "yxms"."product"."product_no" )
在数据源窗口是输入select语句,提示第一行有语法错误,错在哪儿了?怎么修改呢???