Connect Multiple MCP Data Sources via a Single SQL Layer
Otherwise_Series6137 · reddit · 2026-07-10
The author introduces an MCP server solution that unifies multiple SaaS tools, databases, and future NoSQL sources under a single SQL interface, minimizing the number of standard tools an agent needs to handle. Key highlights of the solution include: - 80+ connectors covering SaaS and relational databases like Postgres/MySQL/SQL Server, with NoSQL support planned for the future. - The agent first discovers visible tables and reads schemas before issuing SQL queries, which the system automatically translates into source-specific API calls. - The biggest advantage is cross-source JOINs, allowing direct correlation of HubSpot customers, Stripe billing, and product events in a single SQL query. The author also clearly defines its current boundaries: it is strictly read-only with no write-backs, large queries consume significant tokens, and SaaS API calls remain constrained by rate limits.
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