优化EXISTS方法之后的查询熟读

经过优化后的查询语句如下：

SELECT   
  T4.GROUP_CODE || '&' || T4.GROUP_SEQ || '&' || T2.SOURCE_ID AS MKEY, 	
	T4.GROUP_NAME AS VAL	
FROM
	T_CO_TECHNICS_ROUTE_GROUP T3
	LEFT JOIN T_CO_TECHNICS_ROUTE_CONTROL T2 ON T2.TECH_ID = T3.TECH_ID 
	AND T2.SOURCE_ID = T3.ID 
	LEFT JOIN T_CO_TECHNICS_ROUTE_GROUP T4 ON T2.TECH_ID = T4.TECH_ID 
	AND T2.TARGET_ID = T4.ID 
WHERE
	T3.GROUP_CODE = 'M330' 
	AND T3.DATA_AUTH = 'FA174AFF136D496A87B65443D22357E3' 
	AND EXISTS (
	SELECT 1
	FROM T_WIP_TRACKING B
		LEFT JOIN T_WIP_DETAIL C ON C.MO_NUMBER = B.MO_NUMBER 
		AND B.PRO_SN = C.PRO_SN 
		AND B.DATA_AUTH = C.DATA_AUTH 
	WHERE
		B.PRO_SN = 'H8408L11402P72600286' 
		AND B.DATA_AUTH = 'FA174AFF136D496A87B65443D22357E3' 
		AND C.GROUP_CODE = T4.GROUP_CODE 
		AND C.GROUP_SEQ = T4.GROUP_SEQ 
		AND C.DATA_AUTH = T3.DATA_AUTH 
		AND C.TECH_ID = T3.TECH_ID
	)

这个优化后的查询语句对于EXISTS子查询优化了表别名的使用，并将子查询中的表关联条件直接放在子查询的WHERE子句中。这样可以减少不必要的连接和子查询，提高查询的执行效率。