Computer system, and data retrieval support method

A data retrieval support method to be executed by a computer system which is coupled to a plurality of databases configured to store data having different data types,

• the computer system having a computer including a processor, a storage device coupled to the processor, and a network interface coupled to the processor,
• the computer system being configured to manage a catalog database configured to store a catalog including information on an SQL which has been used,
• the data retrieval support method including:
• a first step of executing, by the computer, in a case of receiving a retrieval request including a first SQL from a user terminal, the first SQL and outputting an execution result of the first SQL to the user terminal;
• a second step of referring, by the computer, to the catalog database, and selecting at least one recommended SQL in which a retrieval condition, which is a retrieval condition for retrieving data by joining the plurality of databases, and is similar to the retrieval condition of the first SQL, is defined;
• and
• a third step of presenting, by the computer, the at least one recommended SQL to the user terminal.