MySQL數據庫複習

今天學習的重點，數據庫查詢語句分組和子查詢web SQL HAVING 語法 SELECT column_name, aggregate_function(column_name) FROM table_name WHERE 條件語句 GROUP BY column_name HAVING aggregate_function(column_name) 值操做數據庫 使用 UPDATE語句來實現修

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