SQLSERVER常用函數使用案例

需求：多附件上傳根據名稱排序後自動命名（規則：附件01_【文件名】，附件02_【文件名】。。。附件10_文件名】依次類推）

數據

SELECT
	ATTACH_ID attachId,
	'附件' + sortNo + '_' + name name,
	ATTACH_SIGN_CD bizKey,
	SIZE size,
	URI uri,
	UPLOAD_TIME uploadTime,
	UPLOADER uploader
FROM
	(
		SELECT
			a.ATTACH_ID,
			a.ATTACH_SIGN_CD,
			a.NAME,
			SIZE,
			a.URI,
			a.UPLOAD_TIME,
			a.UPLOADER,
			CASE
		WHEN len(a.sortNo) = 1 THEN
			'0' + sortNo
		ELSE
			sortNo
		END sortNo
		FROM
			(
				SELECT
					ATTACH_ID,
					ATTACH_SIGN_CD,
					NAME,
					SIZE,
					URI,
					UPLOAD_TIME,
					UPLOADER,
					CAST (
						ROW_NUMBER () OVER (ORDER BY name DESC) AS VARCHAR (20)
					) sortNo
				FROM
					IOP_ATTACH
			) a
	) f

查詢結果集