𝐓𝐡𝐞 𝐨𝐧𝐥𝐲 10 𝐒𝐐𝐋 𝐟𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐬 𝐲𝐨𝐮 𝐚𝐜𝐭𝐮𝐚𝐥𝐥𝐲 𝐧𝐞𝐞𝐝: WITH - readable, reusable queries CASE WHEN - conditional logic LEFT JOIN - keep all left rows COALESCE - replace NULLs ...
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