I currently have an XML document which basically consists of several conversations between people just like an IM conversation.
How I can assign a sequence value to a field \"UID\" which is NUll in existing sqlite table, for example
I\'m getting more and more confused as I try to distinguish from the ambiguities of these terms.I have a query that is taking longer than necessary simply because I cannot get the key on on table to w
I tried to find it out in google but not satisfactory answer is given out there. Can anyb开发者_运维技巧ody explain the solid difference.
I want an index on a non-primary key column, but this column may have nulls in it. I find on a normal unique index, it (rightly 开发者_Python百科so) only allows one null.
An existing DB schema has uniqu开发者_运维技巧e, non-primary, keys, and some foreign keys that rely on them.
I am in the way building some MVC Application and I really love the Data Annotations support in MVC. The build in support is good enough to enforce simple validation checkup. I wonder, how to implemen
I\'m looking to create an ID system for cataloging images.I can\'t use md5() since that will change if I a开发者_开发问答lter the EXIF tags of the image.
I have a model with a CharField that earlier had \"unique\" set to True, but wich now is changed to False. But when i try to save that 开发者_运维问答field with something that exists django still thro
I have a table with just a single field named \"tag\", which is a varchar(250) the field is defined with collation \'latin1_spanish_ci\', because I\'m planning to save words in spanish...
加载中,请稍侯......