如何在列中添加前导零？

Question

So I am importing a customer table and the date values are missing the leading zero for the month, so month column has a value of 2 instead of 02. How can I add a leading zero to the effected dates without adding a zero to dates where the leading zero is no issue? Any help is appreciated. Thanks

Answer 1

If you're storing dates, you should be storing them into a date column in MySQL. It'll pad appropriately, and you'll be able to do proper date-based queries on the data like WHERE BETWEEN or using MySQL's INTERVAL math.

Answer 2

Try select right(concat('0', <YourMonth>), 2) .

Alternatively you could use the MySQL LPAD function, but this is a handy technique to know that you can also use in Excel.