compound-key

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array_key_exists for compound key in array

How do I check to see if a compound key exists with array_key_exists such as $myarr[\'ind1\'][\'ind2\'][详细]

2023-03-30 20:33 分类：问答
How does MySQL handle compound unique indexes with limited lengths?

Assuming two columns in a MySQL (MyISAM) table: title VARCHAR(1500) url VARCHAR(155) I want to create a composite unique index on both columns. I know of the limiting length feature for too long co[详细]

2023-03-29 04:50 分类：问答
Can I avoid redundant primary key columns in a MySQL table for django (python)?

I am aware of the fact, the if I use the ORM of Django every table has to have a primary key column. Somehow if you have a many_to_many table which links to tables (let\'s call them authors and books)[详细]

2023-03-24 18:50 分类：问答
Custom WHERE in storing JTable row in Joomla 1.5

I\'m using JTable to store a record in a table. My table has 3 primary keys(pid,eid,sid). I want to store (Insert,update) a record[详细]

2023-02-25 02:45 分类：问答
How to set cascade on SQLite database with compound primary foreign key?

I have a db that\'s structured with a supertype table as well as subtype tables like so: EVENT PatientId INTEGER,[详细]

2023-02-18 10:30 分类：问答
Creating table with a compound key + a foreign key as compound key

I am having a problem with creating my database in SQL Server Compact I basically have 5 tables ( CentreDeCout, Prof开发者_如何学Goil, Groupe, CCProfilPivot, CCProfilGroupePivot)[详细]

2023-02-12 22:42 分类：问答
Can not set java.lang.Integer field id to org.hibernate.id.IdentifierGeneratorHelper

I need to store some data in a MySQL-database using Jpa 2/Hibernate 3.5.1. For legacy reasons the table I want to store data in has a compound primary key. The first part of the primary key is of type[详细]

2023-01-24 17:42 分类：问答
SQLite table constraint - unique on multiple columns

I can find syntax \"charts\" on this on the SQLite website, but no examples and my code is crashing. I have other tables with unique constraints on a single column, but I want to add a constraint to t[详细]

2022-12-27 19:20 分类：问答
How do garbage collection and background threads interact in .NET?

Let\'s say I create an object, and t开发者_JAVA百科hat object starts a thread, and gives one of its private instance methods to ThreadStart. Later, all references to that object are gone. What happens[详细]

2022-12-17 12:25 分类：问答