sql以某个字段的逗号分开成多条数据

SELECT NEWID(),a.RYBH,NULL,NULL,SUBSTRING(a.ZCZY, b.number, CHARINDEX(',', a.ZCZY+',', b.number)-b.number) AS Specialty,a.ZCZY FROM   DataCenter.dbo.XXZX_YPTQY_T_QY_ZYJSRYZCXX a JOIN MASTER.dbo.spt_va

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