A popular open-source embeddable (i.e. non client-server) RDBMS implemented as a C library.

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69 views

How to optimize query

using SQLite3 and the following query, it seems like there should be a better performing way to write this query? Is there? Select Name, Sum(Case When Used Is ...
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2answers
52 views

Create a result for a line chart with dates

I have this table in SQLite which I use to record the risk level identified in vulnerability assesments according to the day the scan was performed. This table looks like this: Scan Date | Risk ...
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1answer
37 views

Query executes fast, but keeps the table locked for some time

Executing the following query is very fast (75ms), but removing the comment from the last row it becomes slow (2.5s), and the time increases exponentially with the number of rows in the table. It ...
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2answers
1k views

SQLite writing a query where you select only rows nearest to the hour

I've got a set of data where data has been taken approximately every minute for about three month and the time has been stored as a UNIX timestamp. There is no regularity to the timestamp (i.e. the ...
2
votes
1answer
176 views

Configuration options for relational algebra evaluator “ra.jar”

I am participating in the Stanford Database Class, and there are some problem sets to be solved in "mathy" relational algebra syntax. The course instructors demand from students to use this ...
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1answer
211 views

Constructing an SQL query with time intervals

I've a simple but large table in an SQL database which has four fields (id(int PK), time (unix timestamp, not null), value (double, not null) and an ID_fk (integer foreign key). Data is recorded ...
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2answers
45 views

One table with a flag or two tables

I have a problem with the design of a database: In my Android application i need to store the upload (the status, so if the file is in upload it will report the % of the upload) of a file and a list ...
0
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1answer
99 views

Database design for mobile app

At first I would like to say hello to all of you, since it is my first post here on DB Administrators. I am writing an app which store drinks and their data. At the beginning it was storing all in ...
2
votes
1answer
45 views

File database vs application server database for concurrent performance & bulk data

I asked a question about Ripple's database implementation, and received this response: The ripple server uses SQLite for structured data and a configurable "back end" for unstructured "bulk" ...
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1answer
81 views

Can one part of a multi-column primary key be used across tables?

I want to use SQLite as file format for my app, a reporting program. Below is an idea of the kind of schema I'll use (just the first few tables). There will be one report per file and all tables are ...
1
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1answer
24 views

SQLite and Write Ahead Logging: why so large files

I have been doing some operations on SQLite databases recently. The other day I ran a command to DELETE a bunch of rows from a 1GB database file and the WAL file got over 8GBs at which point it ...
0
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1answer
400 views

configure: error: SQLite3 library not found

I'm getting the below configure error while doing the install the Zabbix reporting tool on Linux. i have tried both Versions(zabbix-2.0.9,zabbix-1.8.17), but getting same issue. Log: checking for ...
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0answers
9 views

Datastructure to save relations between more than two entities and lists

I am trying to building an Information Extraction system(IE). I wrote a program that will detect entities and extract relations between them. Now I am saving the relations in the following SQLITE ...
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1answer
20 views

PHP SQLite Admin is running on PHP 5.4

I tried phpsqliteadmin But it doesn't seem to work anymore on PHP 5.4. There are several alternatives, but none of them seems to be "The One" that is maintained and widely used. Is there a standard ...
2
votes
1answer
27 views

Rewrite sqlite trigger to postgresql

Can you help me please with this problem? I need rewrite this simply trigger from sqlite to PostgreSQL format: In sqlite: CREATE TRIGGER connections_INSERT_update_connection_root_trg ...
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0answers
21 views

Approaching multiple values in same column

I'm developing an Android-application that scrapes the schedule for my university and presents it nicely since the current system is a nightmare. I'm processing a lot of data and it gets down to ...
0
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1answer
32 views

Foreign key double inheritance SQLITE

I'm designing a domotic system database and I'm trying to figure out how to represent two foreign keys. This is the cardinality I want. Consider 1...N Areas (rooms, halls, kitchens, etc.): Area 1 - ...
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2answers
63 views

join for between multiple tables without common fields

table E : id, title, datetime table L : id, place, xpos, ypos table M : id, title, datetime, contact, agenda table ER : parentid, childid, parenttype, child type data in ER : e.id, l.id, e, l -> E ...
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1answer
40 views

Joining three tables

I have a question Find the titles of all movies not reviewed by Chris Jackson Where the relations are 3 movie(mID, title, year, director), reviewer(rID, name), rating(rID, mID, stars, ratingDate) ...
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51 views

Problem in Nested Query

I have a query like this SELECT m.title FROM Movie AS M WHERE (SELECT MAX(r.stars) FROM rating AS r WHERE r.mID = M.mID); I want to show the MAX(r.stars) in my result set, what am I doing wrong?
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1answer
60 views

No such column error jdbc

Suppose I have a table: SERVICE={SID,NAME,PORT} and with the help of a Java program, I want to select the SID of the known port with the help of a SQL query: Select SID from SERVICE ...
0
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1answer
185 views

First time using an Index - SQLite / Android

I'm creating a SQLite Database for Android. I can do fairly simple SQL, but I haven't used an index before. I'm working on a table with >150,000 records and I've never dealt with a database so large. ...
3
votes
1answer
45 views

How to show the related (suggested) keywords?

We do a program for cataloging images by assigning keywords (tags) to them. An image has the following keywords "John", "Jane", "Portrait". Another image has the following keywords "John", "Jane", ...
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1answer
61 views

nesting MAX for SELECT

I have a table, containing TV series episodes: series: | series_id | season | episode | title | 1 | 1 | 18 | xxx | 1 | 2 | 3 | xxy | 3 | ...
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1answer
175 views

Why does SQlite return incorrect sum?

CREATE TABLE "Test" ("ItemQty" DOUBLE NOT NULL ); Insert Into Test VALUES (1.4); Insert Into Test VALUES (1.4); Insert Into Test VALUES (1.4); Insert Into Test VALUES (1.4); Insert Into Test VALUES ...
2
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2answers
41 views

EAV-like table with both primary column pointing to the same foreign column

Background: I'm a programmer who, while had to work with simple databases several times, never had to work with complex ones. I.e. I'm proficient with basic stuff, but clueless about advanced features ...
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16 views

Performance One Row With Total Vs Multiple Rows with Seperate Values?

Not 100% sure how to explain this situation but here it goes: I am building an Inventory Database that all items received are entered into and a label is created for each Container, that is going to ...
2
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1answer
33 views

What does 'Vacuum' do in Menial's Base 2 application?

I've had a look at the help documentation for Base 2, as well as Menial's product page, but haven't found an answer there. I've even clicked on the vacuum button and not noticed any change. What does ...
1
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1answer
224 views

Delete word, its meanings, its meaning's example sentences from DB

I have three tables as below (simplified for demonstration): words ===== integer id text word meanings ======== integer id integer word_id text meaning examples ======== integer id integer ...
2
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1answer
583 views

Enable autocomplete in an sqlite3 interactive shell

I am using sqlite3 on a machine where I can use tab completion (ie .read abc<tab> will autocomplete to .read abcdefghij.db. I would like to know how to enable this on my personal machine. Edit ...
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2answers
1k views

select all rows with a minimum value

In Sqlite 3 I'm trying to figure out how to select rows based on a minimum value. I think that I'm limited by not knowing enough of the related terminology to effectively search google. The table ...
6
votes
2answers
4k views

Storing prices in SQLite, what data-type to use?

I am using SQLite and need to store prices. SQLite's REAL data-type says it uses floating-point which is unacceptable storage for prices. Is there a data-type besides TEXT that I can use to store ...
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0answers
350 views

Storing currency with variable floating point in SQLite

We are working with currency and handle currencies from various countries. As a result, we may work with currencies that require no decimal values, two decimal places, three, sometimes four. We also ...
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0answers
102 views

In-memory database vs RAM-disk

In SQLite, are there any differences in performance/features/reliability/... between: 1) an in-memory database: rc = sqlite3_open("file::memory:", &db); 2) a database on a RAM-disk? The ...
0
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1answer
41 views

Order result by number of occurence of a word in a text

I am working with sqlite3/python . I would like to order results by the number of occurence of %@% in text. For exemple Jimmy 10 // Jimmy wrote 10 strings like %@% James 2 Sophia 0 ..etc The ...
1
vote
1answer
23 views

How do I query for fields that have AT LEAST a given range?

Say I have a table of the form: +-----+-------+ | Key | Value | +-----+-------+ | A | 1 | | A | 3 | | A | 4 | | B | 2 | | B | 3 | | C | 3 | | C | 4 | | C | ...
1
vote
1answer
296 views

How do I query for leaf nodes in a hierarchy using a closure table?

I have some hierarchical data (representing musical instruments and playing techniques), where each leaf in the hierarchy is an audio file. The nesting depth of leaf nodes will vary because some ...
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0answers
224 views

SQLite Design: Better to have many tables with few columns or few tables with many columns?

I am struggling to figure out the best design for a Sqlite database that will hold data about Facebook pages so that I can calculate benchmarks for how the average Facebook page performs. I have an ...
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0answers
57 views

Performance difference search on INT or TEXT in SQLite 3

I'm a little bit confused about SQLite 3 type system. SQLite 2 was typeless with only exception of INTEGER PRIMARY KEY. I don't get if SQLite 3 are same or not.. I have in my table PRIMARY KEY of INT ...
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0answers
417 views

SQLite Loop from SELECT QUERY

I have this long query which works one for processing one sale. What I'm trying to do is loop it until no more B.boughtPending = 0 and S.soldPending = 0 and then Select all the ones that ...
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0answers
434 views

SQLite UPDATE two tables from VIEW or TEMPORARY TABLE

Here is the query that doesn't compile just to show how it should look like. But since I can't do Multiple table UPDATE's. This fake query should be able to run the inner UPDATE's for both tables if ...
0
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1answer
35 views

Should the value of a select max be indexed when the where clause is already indexed

I have a customer_orders table in a schema designed to be shared between multiple companies. Each customer_order has an invoice number that should always start at 1 and increment based on company ...
0
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1answer
79 views

Keep rows only if Date exists in both table

This is my first time here, so please bear with me. Assuming i have 2 table, Table 1 Date | Closing 1/1/2013 | 1 2/1/2013 | 2 Table 2 Date | Closing 1/1/2013 | 3 3/1/2013 | 4 What sql statements ...
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2answers
80 views

How to guess or recover a timestamp conversion in sqllite?

I am in the middle of tiny forensic effort =) I am trying to transfer transactions from Money IQ (IOS) to My Wallet+ (IOS) as both apps use sqlite. Money IQ uses a standard unixepoch timestamp. ...
0
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1answer
49 views

SQL - Referential integrity

seems like my problem pretty much describes GC (Garbage Collector) but I don't want to make a procedure to run every X time. so this is my question: I have three tables or more, refer to those as ...
0
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0answers
422 views

Occasional disk I/O errors in SQLite

I have a very simple website running PHP and SQLite 3.7.9 (with PDO). After establishing the SQLite connection I immediately execute the following queries: PRAGMA busy_timeout=0; PRAGMA ...
2
votes
1answer
687 views

Working with multiple databases?

Using sqlite3 on Linux, how can one work with multiple databases? I'd like to do something like the following in database 1? sqlite3 database1.db insert into database1.mytable values (select * from ...
0
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1answer
230 views

Structuring SQLite database with 2 relationships?

I'm current working on a SQLite-database in a android project which will store 3 types of objects; feed, users and posts. There will be several feeds containing several varying users(a user can be ...
0
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0answers
222 views

how to restore sqlite dump file to sqlite database using java?

I generated dump file from java using .dump command so my back-up is ready now I want to restore it to once again so can anyone help me how to restore? In stackoverflow I got this but nothing restore ...
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vote
1answer
3k views

disk I/O error in SQLite

What are the possible things that would trigger the "disk I/O error"? I've been having this problem and I couldn't find a solution. I have a SQLite3 database, and I'm trying to insert data from a file ...