primary-key

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How much I can rely on GUID in .Net?

How mu开发者_如何学运维ch I can rely on GUID in .Net ? My SA told me that we will use GUID as primary keys in all tables.[详细]

2023-04-04 05:50 分类：问答
PRIMARY set as VARCHAR

I have a table where the primary key is set to VARCHAR(14). When I ge开发者_运维知识库t a high volume of visitors, the server\'s I/O rate goes crazy and when using iotop I can see the mysql is the pr[详细]

2023-04-02 14:35 分类：问答
can anyone explain to me what primary keys actually do?

I am reading a book called \"MySQL developer\'s library\" by Paul DuBois and in the book he says: CREATE TABLE score[详细]

2023-04-02 10:13 分类：问答
two tables with the same sequence

Is possible to have two tables with the same incrementing sequence? I was trying to do a tree with ID, NAME, ParentID and i have to join two tables.[详细]

2023-04-01 21:30 分类：问答
Are statistics computed for indexes associated to primary keys in Oracle 9?

I\'m beginning to work with Oracle and I\'ve learn that in Oracle 9 statistics aren\'t collected for an index unless you use COMPUTE STATISTICS, but you can\'t use that option when defining a primary[详细]

2023-03-31 07:21 分类：问答
How to get a Primary ID before or at the same time it gets created?

What I am doing: (wp_posts has ID as primary key and it auto-increase) mysql_query(\"INSERT INTO wp_posts (post_content, post_开发者_Python百科title) VALUES (\'$addEP\', \'$title\')\");[详细]

2023-03-30 14:12 分类：问答
Datanucleus changing column names?

I\'ve got a two classes that look like this: @PersistenceCapable(detachable=\"true\") @Inheritance(strategy=InheritanceStrategy.SUBCLASS_TABLE)[详细]

2023-03-30 09:05 分类：问答
Does MS Access suppress primary key violations on Inserts?

I am in the process of re-writing an MS Access database to SQL server and have found an strange issue开发者_高级运维 in Access that I am hoping someone can help with.[详细]

2023-03-29 17:43 分类：问答
if I have a complex primary key, is it possible to create foreign key only for one column of it?

I have this: ID1 INTEGER 开发者_JAVA百科PRI ID2 INTEGER PRI NAME VARCHAR now I need to: ID1_REF INTEGER REFERENCE TO ID1[详细]

2023-03-29 12:39 分类：问答
Linking Multiple Columns from two tables via Primary Key

I\'m working on designing a system of tables that will let me create a small planner of sorts. The planner itself is an HTML table that draws on two different MySQL tables.[详细]

2023-03-29 08:49 分类：问答