In the oracle statement, the values of a column are combined into one value, separated by commas

1. All versions of Oracle can use the wm_concat() function:

SELECT pos_preeqid,wmsys.wm_concat(to_char(wkid)) FROM worker where pos_preeqid=62 and wkid<40000 GROUP BY pos_preeqid;

2. If it is 11g, use the listagg() within group() function:

SELECT pos_preeqid, ListAgg(to_char(wkid),',') WITHIN GROUP(ORDER BY pos_preeqid) AS xCity FROM worker where pos_preeqid=62 and wkid<40000 GROUP BY pos_preeqid;

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