I understand that you would like to convert SQL queries into GraphQL queries using existing tools or libraries, with a generic solution that is applicable to various databases, but also considering that some tools might work better for specific databases.

To accomplish this goal, I recommend using an existing library or tool to first parse the SQL query and then convert the parsed query into a GraphQL query. For parsing SQL queries, you can use a JavaScript library called sql-parser. It supports parsing SQL queries into an abstract syntax tree (AST), which can then be used to generate GraphQL queries.

You can find the sql-parser library on GitHub: https://github.com/forward/sql-parser

Please note that sql-parser mainly supports MySQL syntax, but it might work with other SQL dialects as well. If you're using a different SQL database, you might want to look for a parser that specifically supports your database's dialect.

Once you have the SQL query parsed into an AST, you can use the structure to construct a GraphQL query. Unfortunately, there isn't a direct one-to-one conversion tool that I am aware of, but you can implement a custom solution to achieve this. Here's a high-level outline of the steps involved:

1. Parse the SQL query using sql-parser or a similar library.
2. Traverse the AST and map the SQL elements to corresponding GraphQL elements.
3. Generate a GraphQL query string based on the mapped elements.

Keep in mind that SQL and GraphQL have different paradigms. SQL is primarily focused on querying relational data, whereas GraphQL is more flexible and designed to work with various data sources. Some SQL features might not have a direct equivalent in GraphQL, so you may need to handle such cases on a case-by-case basis.

If you're using a specific database, there might be other tools that can help you better integrate GraphQL with your database. For example, if you're using PostgreSQL, you can try the postgraphile library, which automatically generates a GraphQL API based on your PostgreSQL schema: https://github.com/graphile/postgraphile

Converting SQL queries to GraphQL queries will require careful consideration of the differences between the two query languages, and you may need to implement some custom logic to handle edge cases or specific requirements.
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