如何使用非默认的排序。例如使用213之类的排序

可以使用如下方法

SELECT DISTINCT

	pg.part_grp_id,

	pg.part_grp_name,

	pg.equip_category_id

FROM

	cost_part_grp pg,

	cost_part_kit pk,

	cost_part_event pe

WHERE

	pe.mdl_ver_id IN (

		SELECT

			s.mdl_ver_id

		FROM

			cost_fleet_model s

		WHERE

			s.fleet_id = 1002

	)

AND pe.part_kit_id = pk.part_kit_id

AND pk.part_grp_id = pg.part_grp_id

ORDER BY

	CASE pg.equip_category_id

WHEN 2 THEN

	1

WHEN 1 THEN

	2

WHEN 4 THEN

	3

ELSE

	4

END

原文链接：https://blog.csdn.net/skytalemcc/article/details/5883728

mysql如何更新替换某一个字段中的特定字符串

UPDATE t_bss_employees

SET mobilephone = REPLACE (mobilephone, "2129", "0000")

WHERE

	id IN (

		SELECT

			a.id

		FROM

			(

				SELECT

					id

				FROM

					t_bss_employees

				WHERE

					mobilephone IN (

						'18121299262',

						'18121299247',

						'18121299206',

						'18121299209'

					)

			) AS a

	)

将mobilephone字段中的2129字符串替换为0000

使用当前表为条件更新当前表。需要在条件处再添加一个（）构建一个虚拟表

求比例的sql

	select a.style, ROUND(

            b.num / a.sum * 100,

            2

        ) as styleRate from (SELECT

	count(qspc.id) sum

	,qq.style  style

	from  t_qc_security_plan_comment  qspc

		inner join t_qc_question qq

		on qq.id = qspc.question_id

		LEFT JOIN t_qc_address qa ON qa.id = qspc.address_id

		LEFT JOIN t_system_organ  so on qa.hospital =  so.id

		WHERE qq.scr_level is not NULL

		and qq.type = 3  and so.tenant_code = 'zzyy'

		GROUP BY style) a left join (SELECT

	count(qspc.id) num

	,qq.style  style

	from  t_qc_security_plan_comment  qspc

		inner join t_qc_question qq

		on qq.id = qspc.question_id

		LEFT JOIN t_qc_address qa ON qa.id = qspc.address_id

		LEFT JOIN t_system_organ  so on qa.hospital =  so.id

		WHERE qq.scr_level is not NULL

		and qq.type = 3  and so.tenant_code = 'zzyy'

		and qspc.is_bad =0

		GROUP BY style) b on a.style = b.style

计算逻辑是分别求总数和平均数。然后两数相除再用round求精度

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