Best SQL Client on ipad

If you won't be connecting to a database what do you expect a "SQL Client" to do for you?

You mention practice but what type of practice?  Without some sort of database emulation or actual database you are really just practicing typing.

If you actually want to practice SQL to see results, I suggest something web-based like: http://sqlfiddle.com/

I won't connecting to an *online* database such as a corporate database.
Some of the tools I have seen are for people who will be managing a corporate database from their ipad. I will be practicing Sql queries with local database tables that I will create. I have looked Sqlite but I see there
a number of commands it does not support.

>>I have looked Sqlite but I see there a number of commands it does not support.
there will be limitations of this sort in almost any option running on an iPad iThink
(pardon pun)

as suggested sqlfiddle is a very useful tool (SQLite, Oracle, MySQL, MS Sql Svr, Postgres
- but restricted to small amounts of data (the DDL is limited to 8,000 chars)
and I don't know how well that UI works of iPad (but worth trying!)

Do you have a dbms that you particularly want to learn?

Ms Sql Server