Oracle： select LPAD(number_no,20,'')  from dual

select LPAD(3,20,'')  from dual

效果：000000000000000000003

Mssql:

select replicate('',20)+ltrim(tt.number_no) from Tabletest as tt

效果：000000000000000000003

MySQL：

 select LPAD(number_no,20,'')  from dual

同时 在MySQL中 继续调用其他存储过程的方法：

CALL get_water("Water",1,water_num);

Oracle 的调用：

 get_water('Water'1,water_num);

mssql:中的调用：

exec  get_water  "Water",1,water_num output;