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How do I concatenate const/literal strings in C?
...tressed enough. Misuse of strcat, strcpy, and sprintf are the heart of unstable/insecure software.
– plinth
Nov 21 '08 at 13:33
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MongoDB/NoSQL: Keeping Document Change History
...ific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can write all changes from all source tables to a single table (more of a log) or have a separate h...
How do I (or can I) SELECT DISTINCT on multiple columns?
I need to retrieve all rows from a table where 2 columns combined are all different. So I want all the sales that do not have any other sales that happened on the same day for the same price. The sales that are unique based on day and price will get updated to an active status.
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Good Hash Function for Strings
...le check - The hashCode() return value will be used by Java to map to some table index before storing the object. So, if the hashCode() returns m, it does something like (m mod k) to get an index of the table of size k. Is that right?
– whitehat
Oct 17 '15 at 2...
How do I query between two dates using MySQL?
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Your query should have date as
select * from table between `lowerdate` and `upperdate`
try
SELECT * FROM `objects`
WHERE (date_field BETWEEN '2010-01-30 14:15:55' AND '2010-09-29 10:15:55')
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Update multiple rows in same query using PostgreSQL
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You can also use update ... from syntax and use a mapping table. If you want to update more than one column, it's much more generalizable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where c.column_b = t.c...
How to get distinct values for non-key column fields in Laravel?
...should use groupby. In Query Builder you can do it this way:
$users = DB::table('users')
->select('id','name', 'email')
->groupBy('name')
->get();
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MySQL Query to select data from last week?
Hi I have a table with a date field and some other information.
I want to select all entries from the past week, (week start from Sunday).
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Display block without 100% width
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Use display: table.
This answer must be at least 30 characters; I entered 20, so here's a few more.
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Having a UITextField in a UITableViewCell
...o, I'm still unable to have a fully working UITextField in some of my UITableViewCells , just like in this example:
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