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SQLite DateTime comparison
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I had the same issue recently, and I solved it like this:
SELECT * FROM table WHERE
strftime('%s', date) BETWEEN strftime('%s', start_date) AND strftime('%s', end_date)
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What is `related_name` used for in Django?
...ted name is a must in case there 2 FKs in the model that point to the same table. For example in case of Bill of material
@with_author
class BOM(models.Model):
name = models.CharField(max_length=200,null=True, blank=True)
description = models.TextField(null=True, blank=True)
tomateria...
SQL- Ignore case while searching for a string
I have the following data in a Table
PriceOrderShipped
PriceOrderShippedInbound
PriceOrderShippedOutbound
In SQL I need to write a query which searches for a string in a table. While searching for a string it should ignore case. For the below mentioned SQL query
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Paging with Oracle
...ults were returned slightly quicker the first time I ran the queries on my table (113 million+ rows) for the new method:
New method: 0.013 seconds.
Old method: 0.107 seconds.
However, as @wweicker mentioned, the explain plan looks much worse for the new method:
New method cost: 300,110
Old met...
Managing relationships in Laravel, adhering to the repository pattern
... design patterns in Laravel I found myself creating repositories for every table on the application.
4 Answers
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How can I call a custom Django manage.py command directly from a test driver?
...for a Django manage.py command that does a backend operation on a database table. How would I invoke the management command directly from code?
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Entity Framework with NOLOCK
...This essentially does the same as NOLOCK, but instead of doing it on a per table basis, it will do it for everything within the scope of the transaction.
If that sounds like what you want, here's how you could go about doing it...
//declare the transaction options
var transactionOptions = new Syst...
SQL update query using joins
I have to update a field with a value which is returned by a join of 3 tables.
11 Answers
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What is the point of function pointers?
...d what is going on inside of the abstraction. Also, implementing your own vtable in C and write object oriented code there is a really good learning experience.
– Florian
Jun 2 '12 at 10:49
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Drop data frame columns by name
...multiple variables:
within(df, rm(x, y))
Or if you're dealing with data.tables (per How do you delete a column by name in data.table?):
dt[, x := NULL] # Deletes column x by reference instantly.
dt[, !"x"] # Selects all but x into a new data.table.
or for multiple variables
dt[, c("x","y...