Not sure on what the best practices are for dealing with NULL values when I have a single table where two fields are only sometimes populated creating a lot of NULL values in the rows.
I have a table with 15 columns ( 10 of them are string value) and about 50000 rows. It contain a lot empty string value ..开发者_C百科. I search if is there a query that I can pass a table name for it
I\'d like to remove a child (background) via another class. I can\'t seem to be able to tar开发者_运维问答get it! It always returns me null or error 2025 and stuff... hehe.
Ugly: string city = null; if (myOrder != null && myOrder.Customer != null) city = myOrder.Customer.City;
I\'m developing a Rails application, and in order to see the app with some demo content, I created a rake task to populate the database with some dummy data. The relevant code is here:
I want to left join two tables. My problem is that the table from the \"right\" does not exist in the database. I need to create it during the query. In more details, the \"right\" table is obtained b
i have a JML questions. what is the difference between /*@ invariant array_ != null; */ and declaring it as
I am following Apples Core Data Tutoriol but implementing it into my own Project, this means I\'ve not started by creating a Project using Core Storage Data. So I\'ve been copying and pasting quite a
I have the following JPQL/HQL snippet in a SELECT ... MAX(CASE WHEN scf.finalScore = 20 OR scf.finalScore = 0 THEN NULL ELSE scf.finalScore END) AS hi,
This code outputs True. using System; using System.C开发者_如何学JAVAollections.Generic; public class Default
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