Given this table:
create table t1 (Task: insert exactly 1 million records in table t1, with the following constraints:
dt datetime not null,
primary key (dt)
- Use a maximum of 5 (five) SQL statements;
- Use only the MySQL interactive command line client;
- No shell commands;
- No loading of scripts;
- No inserts from existing tables in your system. You must assume that t1 is the only table in your entire database;
- No MySQL Proxy;
- No stored routines, triggers or events;
- Each statement must be not longer than 75 characters;
- UPDATE. No modification of table t1;
- No LOAD DATA.
I will publish the solution at the end of the week.
To make sure that I am not cheating, here is the MD5 signature of the solution file that I will publish this week.
fc6d32faf19b5ac1064093a6d7969f7c solution.txtIf you are paranoid and believe that I can create an arbitrary file and make its contents match with the above MD5 signature, you have until Friday to get the solution from that. :)
Update: To keep the challenge interesting, I won't publish the comments with the right solutions for a few days. If you have sent a comment, don't worry if it does not show up immediately. I will publish it soon before the final solution.
Solutions so far
- Shane. Three lines. Less than 6 seconds. And close to the original solution! (Your third solution is almost the same as the intended one)
- Jedy. Three lines! and less than 6 seconds to execute! on top.
- Dipin. Your latest solution (3 lines) tops the list.
- Kai Voigt. one solution with the crowd, and a wicked one like Roland's, but much faster!
- Roland Bouman. This is the wickedest solution so far. Not the shortest, but it's the one that is totally different from the intended one (and the other solutions). It will crash most weak servers, though.
- Carsten. In the same league as Kai and Roland for the wicked solution.
- Dirk1231. The challenge requires not to use other tables. (Also your second solution does). The third attempt put you finally in the list! Your fourth solution is nice, but not enough to climb to the top.
- Sergey Zhuravlev. Excellent! Can you do it without creating a table? (your second solution is very nice and imaginative)
- WSchwach. Your solution qualifies as cheating. Altering the given table to insert duplicate records is not a valid solution. Good shot, nonetheless!
- Morgan Tocker. Very creative! That's very good.
- Matthias. Good use of the allotted characters.
- Ephes. Not bad. But you are not assuming that t1 is the only table in your system. Will you try without creating tables?
- Hubert. Nice try. One of the elements you mentioned will lead you to the right track. Keep trying.
- Bill Karwin. I did not specify that the numbers should be contiguous, and you took advantage of it! Well done!
- Domas. Good solution. I expected more from you.
- Tobias. Your first solution runs forever. The second one is cheating (using a information_schema table)
- Erik. Nope. No other tables allowed. Not even information_schema tables.
- William: Nope. No stored routines allowed. And the instruction to create the routine is longer than 75 characters. Your second solution has a command longer than 75 chars, and it's using other tables, and it does not work either!
Some hintsKeep trying, and consider that my intended solution does the following:
- Inserts contiguous records;
- Uses all dates in this century;
- Does not insert from ANY table, not even t1;
- Does not use LIMIT;
- The total execution time is below 7 seconds.