If I 开发者_运维知识库do INSERT INTO table1 (datetime1, datetime2) VALUES (NOW(),NOW()) Will the two fields always be identical in both columns?
There are two ways to store enum types in database: as a string or as an integer. Saving the enumeration ( sex = {male,female}, account_type = {regular,pro,admin}, etc. ) as strings makes things more
I have a bunch of products with a bunch of different possible attributes for each product. E.g. Product A has a name, size, color, shape. Product B has a name, calories, sugar, etc. One way to solve t
Hibernate\'s Criteria API has Restrictions.ilike function which has the following contract: A case-insensitive \"like\", similar to Postgres ilike operator
I\'m pretty stumped here. I have 2 tables and I\'m left joining the first (around 500k records) with the second (around 2.2 million records) in order to find out which records are in the first and no
I think my question might be unclear , but 开发者_如何学运维i would try to explain it by example .
I\'m implementing a database where several tables have string data as candidate keys (eg: username) and will be correspondingly indexed.For these fields I want:
We want to use the Entity Framework (.NET 4.0) to开发者_Go百科 build applications that can deal with Sql Server, MySQL and Oracle. And maybe Sqlite too.
This question already has answers here: Closed 12 years ago. 开发者_运维问答 Possible Duplicate: Can I protect against SQL Injection by escaping single-quote and surrounding user input with s
I\'m embarking on an adventure in JPA and want to, inasmuch as possible, stay database agnostic.What orm.xml features should I avoid to stay database agnostic?
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