SELECT t.compname, min(t2.version) FROM archdetails t INNER JOIN svn3 b ON t.compname = b.compname INNER JOIN archdetails t2 ON t.compname = t2.compname
I need constr开发者_StackOverflow中文版aints created in the following manner: CONSTRAINT [IX_Unique_1] UNIQUE NONCLUSTERED
form wikipedia:http://en.wikipedia.org/wiki/Index_(database) Some databases extend the power of indexing by allowing indexes to be created on functions or expressions. For example, an index could be
I am trying to generate hibernate-mapping from POJOs with hibernate annotations. Then I want to use liquibase to generate database schema.
Content of a website is stored in a MySQL database. 99% of the 开发者_高级运维content will be enabled, but some (users, posts etc.) will be disabled. Most of the queries end as WHERE (...) AND enabled
I need to store a undirected graph in a Google App Engine database. For optimization purposes, I am thinking to use database indexes.
Is there a way to see a list of indices on a collection in mongodb in shell?i read through http://www.mongodb.org/display/DOCS/Indexes but i dont 开发者_如何转开发see anythingFrom the shell:
I access several tables remotely via DB Link.They are very normalized and the data in each is effective-dated.Of the millions of records 开发者_StackOverflow社区in each table, only a subset of ~50k ar
I create indexes without the USING BTREE clause. Is there any advantage of using BTREE开发者_运维技巧 index?
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