-- 字符函數
SELECT id,
LENGTH(id) as l_id,
LEFT(id,2),
RIGHT(id,3),
UPPER('bat'),
LOWER('BAT'),
TRIM(' BAT '),
substring(id,3),
substring(id,2,1),
concat('ad','11223'),
CONCAT(10.0/33*100,'%'),
POSITION('2' IN id),
substring(id,position('2' IN id),3)
from hy_order_20170410;
– 結果附圖:
附圖2: