Primary key in relational tables. Composite primary key or unique primary key in those pure relational tables?
This is the schema of my table: create table LPCG(ID integer primary key, PCG text, Desc text, test text);
I have a post class and it kind of works, but there\'s one problem: the primary key doesn\'t increase.
What\'s the benefit of defining the primary key attribute as virtual in entity Framework? AFAIK, virtual is used for lazy loading in navigation properties and for change tracking in other properties.
I inherited a SQL Server database where many tables have a primary key of type numeric(18,0) . What reasons (historical perhaps?) would someone choose this datatype for 开发者_JS百科a primary key?I w
I have (all InnoDB) a parenttable tbl1 with primary key some_id and child (referencing) table tbl2 with another_id referencing tbl1.some_id as foreign key. tbl2.开发者_StackOverflow社区another_id is n
I have a MySQL database whose keys are of this type: A_10 A_10A A_10B A_101 QAb801 QAc5 QAc25 QAd2993 I would like them to sort first by the alpha portion, then by the numeric portion, just like abo
I have a table with 2 primary keys (so the combination of both of them should be unique).The schema is like this:
Assuming this table with nearly 5 000 000 rows CREATE TABLE `author2book` ( `author_id` int(11) NOT NULL,
In django, I want to copy data from identical tables in one db to those in another -- from \'db01\' to \'default\'. Schema are identical.
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