Top "Rdbms" questions

A relational database management system (RDBMS) is a database management system (DBMS) in which data is stored in tables and the relationships among the data are also stored in tables.

PostgreSQL IN operator with subquery poor performance

Why is the "IN" operator so slow when used with subquery? select * from view1 where id in (1,2,3,4,5,6,7,8,9,10) order by somedata; …

performance postgresql rdbms operator-keyword
How to get the byte size of resultset in an SQL query?

Is it possible to get the size in bytes of the results of an sql query in MySQL? For example: …

sql mysql rdbms
How to implement ONE-TO-MANY in a database

I want to implement one-to-many concept in my application. This is the scenario: I have two tables (i). Person(ID, …

database-design foreign-keys rdbms
What's the correct name for an "association table" (a many-to-many relationship)

What's the correct or most popular name for an "association table"? I've heard lookup, associative, resolving, mapping and junction table.

sql mysql sql-server oracle rdbms
TRIGGERs that cause INSERTs to fail? Possible?

In cleaning up this answer I learnt a bit about TRIGGERs and stored procedures in MySQL, but was stunned that, …

mysql triggers rdbms
Update specific field on SOLR index

I want to using solr for search on articles I have 3 table: Group (id , group name) ArticleBase (id, groupId, some …

lucene solr rdbms
How many significant digits should I store in my database for a GPS coordinate?

I have in my MySQL database both longitude and latitude coordinates (GPS data). It's currently stored as: column type ------------------------ …

mysql database database-design gps rdbms
RMySQL dbWriteTable with field.types

I have a data frame, called df, that looks like this: dte, val 2012-01-01, 23.2323 2012-01-02, 34.343 The type on …

mysql sql r rdbms rmysql
How to store data with dynamic number of attributes in a database

I have a number of different objects with a varying number of attributes. Until now I have saved the data …

mysql database rdbms
What's the difference between NoSQL and a Column-Oriented database?

The more I read about NoSQL, the more it begins to sound like a column oriented database to me. What's …

database rdbms nosql column-oriented