Two statements. Two scans of your staging data. And a subtle race condition if anything else touches the target in between. I've seen this pattern in almost every data warehouse codebase I've worked ...
𝗠𝘆𝗦𝗤𝗟 𝗪𝗜𝗧𝗛 𝗖𝗹𝗮𝘂𝘀𝗲 𝗮𝗻𝗱 𝗖𝗧𝗘𝘀 Stop nesting subqueries. Nested queries are hard to read. Use CTEs. Common Table Expressions make your SQL clean. MySQL 8.0 added the WITH keyword. The ...
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