23. A relational database search system, comprising: a basic table storage device storing a plurality of basic tables to be searched; an intermediate link table generating device automatically generating an intermediate link table indicating a link condition directly or indirectly linking two optional basic tables stored in said basic table storage device; an intermediate link table storage device storing an intermediate link table generated by said intermediate link table generator; a SQL generation process device automatically generating a structured query language (SQL) statement according to input selection information by referring to the intermediate link table stored in said intermediate link table storage device; and a SQL response trial device allowing a quicker-response structured query language (SQL) statement to be automatically generated when a plurality of SQL statements which outputs an equal search result can be generated according to the input selection information.
24. The system according to claim 23, wherein when a response time of the structured query language (SQL) statement generated by said SQL generation process device according to the input selection information is longer than a reference time, said SQL response trial device generates another SQL statement which outputs a same search result as said SQL statement, and when a response time of the other SQL statement is within the reference time, the intermediate link table is updated.