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使用 TO_CHAR 函数 可以將字格式化
SELECT TO_CHAR(12345678,'999,999,999') , TO_CHAR(12345678,'FM999,999,999') FROM DUAL
==> 12,345,678 ( with space ) , ==> 12,345,678 ( without space )
SELECT TO_CHAR(12345678,'000,000,000') FROM DUAL
==> 012,345,678
若用於日期的話
SELECT TO_CHAR(20090615,'9999,99,99') FROM DUAL
只能做到逗號 ' , ' 的效果...>"<
只剩這招比較合適
SELECT TO_CHAR( TO_DATE(20090615,'YYYYMMDD') , 'YYYY/MM/DD') FROM DUAL
==> 2009/06/15
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