update PPC_TASK_CENTERset RECEIVER = ,RECEIVE_DATE = ,POS = ,TASK_STATUS = 'PIGEONHOLE'where PKID =

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update PPC_TASK_CENTER
set RECEIVER = ,RECEIVE_DATE = ,POS = ,TASK_STATUS = 'PIGEONHOLE'
where PKID =

代表一个变量,是一个变量占位符