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hive-去字符串前导0
- leading:去掉字段串前的0
- TRAILING:去掉字段串后的0
- BOTH:去掉字段串前后的0
0的数量可以是不确定个数，也可以用这种方法去掉某些字符前缀后缀
SELECT a,trim(leading '0'FROM a) AS c1,trim(BOTH '0'FROM a) AS c2,trim(TRAILING '0'FROM a) AS c3
FROM (SELECT '010100100' AS aUNION ALLSELECT '10100100' AS aUNION ALLSELECT '0000010100100' AS aUNION ALLSELECT '00000a0100100' AS a) t
输出结果
a c1 c2 c3
00000a0100100 a0100100 a01001 00000a01001
0000010100100 10100100 101001 00000101001
010100100 10100100 101001 0101001
10100100 10100100 101001 101001
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