oracle字符型转换为数值型 oracle里面怎么字符串转成number？

oracle里面怎么字符串转成number？

WITH t AS (SELECT "abcdefghijklmn" AS a FROM dual UNION ALL SELECT "abcdefgh" AS a FROM dual UNION ALL SELECT "abcd" AS a FROM dual) SELECT CASE WHEN length(lpad(t.a， 8， "0")) = 8 THEN lpad(t.a， 8， "0") ELSE substr(t.a， 1， 8) END AS a FROM t

oracle字符型转换为数值型 oracle将字符类型转换为数字 varchar转换成number

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