Question

i wanted to create a field , which is all in same length.
i.e , all the column named ‘id’ should be like 000001 , 000002 .. 999999 , not 1 , 2 , .. 999999.
If i wanted a 6 digits length field with varchar(6) auto_increment.

Many thanks !

Answer 1

To do this, you have to use the ZEROFILL option when creating your field. For instance

CREATE TABLE MyTable(
ID INTEGER(11) ZEROFILL AUTO_INCREMENT 
,SomeValue Varchar(100)
,PRIMARY KEY(ID)
);

If you only want 6 digits, then use

ID INTEGER(6) ZEROFILL AUTO_INCREMENT

Instead of 11 listed in the first part. However, after you reach 1,000,000, the columns will no longer be padded to the same length, because all values below 1,000,000 will only have 6 digits. However, it will continue to increment past the 6 digits specified, all the way to the maximum value for an integer (2 billion).