NSArray *test1 = [NSArray arrayWithObjects:@\"1\",@\"2\", nil]; NSArray *test2 = [NSArray array开发者_JAVA技巧WithObjects:@\"1\",@\"2\", nil];
If I want to do a check a name, I want to see how many rows/name exists in the \"username\" column under users table. Lets say thousands ... hundred of thousands, should I use:
I always forget how to do things like this. 开发者_StackOverflow社区I have a database table with birthdates and I want to find out how many people have the same age.
I have a MySQL database where users can list books they\'ve read, want to read etc. I\'m trying to write a query to find the most common book 开发者_如何学Gothat users have listed.
I tried to update a particular record with same value again and again, but it returns the affected rows value as 1 always.
I am connecting to a sockets API that is very inflexible.It will return rows such as: NAME, CITY, STATE, JOB, MONTH
(This is rather hypothetical in nature as of right now, so I don\'t have too many details to offer.) I have a flat file of random (English) words, one on each line.I need to write an efficient progra
I\'d like to limit the entries in a table. Let\'s say in table tBoss. Is there a SQL constraint that checks how many tuples are currently in the table? Like
I\'m trying to count开发者_如何学编程 all the values inside an array, I\'ve tried using count() but to no avail, the array values may also have negatives in them, example:
When I use User.count(:all, :group => \"name\"), I get multiple rows, but it\'s not what I want. What I want is the count开发者_Python百科 of the rows. How can I get it?Currently (18.03.2014 - Rail
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