Tag: database

60 votes
19 answers
1.3K views
MongoDB or CouchDB - fit for production?

I was wondering if anyone can tell me if MongoDB or CouchDB are ready for a production environment.

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Boyd
0 1 0 9
asked 07 September, 2021
62 votes
11 answers
1.7K views
How do you query for "is not null" in Mongo?

I would like to execute a following query: db.mycollection.find(HAS IMAGE URL) What should be the correct s

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Lorenzo
0 1 0 9
asked 07 September, 2021
60 votes
10 answers
435 views
How do you rename a MongoDB database?

There's a typo in my MongoDB database name and I'm looking to rename the database. I can copy and d

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Adolfo
0 1 0 9
asked 07 September, 2021
60 votes
17 answers
1.4K views
How can I list the tables in a SQLite database file that was opened with ATTACH?

What SQL can be used to list the tables, and the rows within those tables in an SQLite database file - once I

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Janella
0 1 0 9
asked 07 September, 2021
63 votes
7 answers
2.1K views
What are the options for storing hierarchical data in a relational database?

Good Overviews Generally speaking, you're making a decision between fast read times (for example, nested

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Leonardo
0 1 0 9
asked 07 September, 2021
52 votes
28 answers
2.1K views
Insert into ... values ( SELECT ... FROM ... )

I am trying to INSERT INTO a table using the input from another table. Although this is entirely feasible for

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Basil
0 1 0 9
asked 07 September, 2021
60 votes
27 answers
2.9K views
What is the difference between "INNER JOIN" and "OUTER JOIN"?

Also how do LEFT JOIN, RIGHT JOIN and FULL JOIN fit in?

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Louetta
0 1 0 9
asked 07 September, 2021
59 votes
3 answers
1.6K views
How does the HyperLogLog algorithm work?

I've been learning about different algorithms in my spare time recently, and one that I came across which

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Serina
0 1 0 9
asked 07 September, 2021
54 votes
14 answers
2K views
What are the differences between B trees and B+ trees?

In a b-tree you can store both keys and data in the internal and leaf nodes, but in a b+ tree you have to stor

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Winford
0 1 0 9
asked 07 September, 2021
58 votes
7 answers
2.3K views
Codeigniter - multiple database connections

I have to retrieve a MySQL database information from master database and then connect to that database, and fe

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Louetta
0 1 0 9
asked 07 September, 2021
65 votes
1 answers
2.7K views
Advantages / Disadvantages of pconnect option in CodeIgniter

One of the parameters in the CodeIgniter database config is the following ['pconnect'] TRUE/FALSE

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Janella
0 1 0 9
asked 07 September, 2021
62 votes
11 answers
948 views
CodeIgniter - return only one row?

At the moment if I am doing a query on the database that should only return one row, using: ...query stuff...

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Carmelina
0 1 0 9
asked 07 September, 2021