WITH語句是SQL中的一種語法結構，用于創建臨時視圖或臨時表，在后續的查詢中可以直接引用這些臨時視圖或臨時表。
WITH語句的一般語法如下：
WITH [臨時視圖名] AS (
SELECT [字段列表]
FROM [表名]
WHERE [條件]
GROUP BY [分組字段]
HAVING [分組條件]
ORDER BY [排序字段]
)
SELECT [查詢字段]
FROM [臨時視圖名]
WHERE [條件]
GROUP BY [分組字段]
HAVING [分組條件]
ORDER BY [排序字段]
WITH語句的具體使用方法如下：
使用WITH語句可以簡化復雜的SQL查詢語句，提高查詢效率，同時也可以使SQL代碼更易于閱讀和維護。
