oracle tapping sub-query returns multiple results of

Use wmsys.wm_concat function to splice

Examples are as follows:

SELECT to_char(wmsys.wm_concat(to_char(sub.SUBSPCL_CD ))) FROM META.SUBSPCL sub,EMR.INVITEE inv WHERE inv.SUBSPCL_UUID = sub.SUBSPCL_UUID AND sub.DEFUN_IND = '0' AND inv.DEFUN_IND = '0' AND inv.SUBJ_ID = cslt.CSLT_ID

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Origin www.cnblogs.com/cykfory/p/11759790.html