foreign-keys

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Create association on non-primary key fields with Entity Framework 4.1 Fluent API

We are using EF 4.1 and the fluent API to get data from a legacy database (that we are not permitted to change). We are having a problem creating a relationship between two tables where the related co[详细]

2023-03-26 23:05 分类：问答
MySQL Syntax in creating Foreign Key

Is this syntax correct in creating a Foreign Key? create table department ( de开发者_开发技巧partmentID int not null auto_increment primary key,[详细]

2023-03-26 19:01 分类：问答
MySQL unique composite constraint not working

I\'ve created a unique index like this: ALTER TABLE items ADD UNIQUE INDEX uni_item (warehouse_id, width, height, depth, weight);[详细]

2023-03-26 16:42 分类：问答
postgres getting data where two column references same parent id

There are 3 table in postgres database CREATE TABLE tab_name ( name_id 开发者_StackOverflow中文版integer NOT NULL,[详细]

2023-03-26 16:25 分类：问答
Creating a dynamic path when I upload images

I\'m trying to create a dynamic path for when my users upload images. It works something like this: View:[详细]

2023-03-26 11:02 分类：问答
SQL Conditional relationships

I\'ve come up with two approaches to the same idea and would like to avoid any obvious pitfalls by using one over the other.I have a table (tbl_post) where a single row can have many relationships to[详细]

2023-03-26 08:54 分类：问答
DELETE all where MySQL foreign key constraint does not fail

I am trying to delete a few records but am getting the following error: Cannot delete or update a parent row: a foreign key constraint fails[详细]

2023-03-26 07:52 分类：问答
Convert SQL statement 'LIKE' to JPQL statement

I want to write this SQL statement in eclipse JPQL query. It works in SQL but I\'m not sure how to write it in eclipse.[详细]

2023-03-25 17:19 分类：问答
Thread-Safety and the Foreign Key Constraint

Background Given: a set of threads each thread has its own data source objects in each data source references objects in other data sources[详细]

2023-03-24 23:29 分类：问答
Foreign Key relationships in ASP.NET MVC

I have a parent table and a child table. Parent Table: int AID, nvarchar parentname, nvarchar description[详细]

2023-03-24 16:41 分类：问答