As mentioned above, do not store credit card information in a database. It’s a recipe for trouble. Doing so will make you a very attractive target for hackers and, if they are successful in retrieving them, end your business and potentially ruin your life as well as the lives of those whose credit card numbers … Read more
Quoted from the CREATE TABLE Syntax page: A PRIMARY KEY can be a multiple-column index. However, you cannot create a multiple-column index using the PRIMARY KEY key attribute in a column specification. Doing so only marks that single column as primary. You must use a separate PRIMARY KEY(index_col_name, …) clause. Something like this can be … Read more
There is no built-in function that counts occurences of substring in a string, but you can calculate the difference between the original string, and the same string without commas: LENGTH(fooCommaDelimColumn) – LENGTH(REPLACE(fooCommaDelimColumn, ‘,’, ”)) It was edited multiple times over the course of almost 8 years now (wow!), so for sake of clarity: the query … Read more
SELECT Id, Url, ModelId WHERE Url LIKE CONCAT(‘%’, ModelId, ‘%’)
From documentation: To comply with the SQL standard, IN returns NULL not only if the expression on the left hand side is NULL, but also if no match is found in the list and one of the expressions in the list is NULL. This is exactly your case. Both IN and NOT IN return NULL … Read more
As of Django 1.5, you can use the Meta.index_together option: class QuoteModel(models.Model): # … fields … class Meta: index_together = [ (“sequence”, “stock”), ] (note: the original answer from 2009 said it was not possible to index multiple fields; it has since been replaced)
Try like this: echo “select 1” | mysql
Easiest way by far, just add zero! Examples: SET @yournumber1=”1.500″, @yournumber2=”23.030″, @yournumber3=”2.000″, @yournumber4=”4.450″ ; SELECT (@yournumber1+0), (@yournumber2+0), (@yournumber3+0), (@yournumber4+0) ; +——————+——————+——————+——————+ | (@yournumber1+0) | (@yournumber2+0) | (@yournumber3+0) | (@yournumber4+0) | +——————+——————+——————+——————+ | 1.5 | 23.03 | 2 | 4.45 | +——————+——————+——————+——————+ 1 row in set (0.00 sec) If the column your value comes from is … Read more