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

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3
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2answers
2k 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 ...
0
votes
2answers
36 views

Create database with multiple columns using SQLite in Android Studio

I want to create a database with 3 columns (name of point of interest, longitude and latitude). Since I am completely new to databases I am using an example I found online and try to change it to my ...
0
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2answers
63 views

sqlite group_concat error while executing query

I have table: CREATE TABLE www ( Col_1 VARCHAR, Col_2 VARCHAR ); select count(*) from www; --1496 And I have error: "Error while executing query: aggregate function are not allowed in ...
2
votes
1answer
293 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 ...
1
vote
1answer
20 views

How to optimize search restricted by boolean column?

I want to optimize a query1 of the form SELECT yid, xid FROM x WHERE is_principal; Here, is_principal is a non-null boolean column of x. If I run EXPLAIN QUERY PLAN on this query, the output I get ...
1
vote
1answer
145 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 ...
0
votes
1answer
113 views

SQLite disk I/O error (3850)

I can't seem to figure out what is causing the I/O Error: $sqlite3 db.sqlite < data.sql (3850) disk I/O error Error: near line 2: disk I/O error (3850) disk I/O error Error: near line 3: disk ...
0
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1answer
151 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 ...
0
votes
1answer
818 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 ...
0
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1answer
5k views

how to import .xls file into SQLite database?

I have an issue with importing .xls file into SQLite database. I am working on windows xp and using a SQLite manager for maintain the database. I can import the .csv file to the database by using ...
0
votes
1answer
459 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 ...
2
votes
0answers
233 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 ...
2
votes
0answers
515 views

SQLite Performance Tuning

I have the following query, which fetches data from only one table. It is a query which is supposed to return data for an autocomplete function. Autocomplete data can be in text1 or text2. The ...
1
vote
0answers
102 views

Migrate from SQLite to MySQL (then back)

For various reasons, I must use a SQLite database with a local application. However, I wrote a Flask app that enables users to more easily classify items in the database, and it runs very slow on ...
1
vote
0answers
687 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 ...
1
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0answers
134 views

Regular Expression Integrity Constraints in SQLite3

In a SQLite3 CREATE TABLE statement, can I use a regular expression to enforce a particular constraint? Specifically, I am trying to require that an inputted URL is valid. I know there are other ways ...
1
vote
0answers
192 views

Calculate lower and upper quartile of SQLiteDB via query

I want to calculate the upper and the lower quartile of the value what I call "diffs" in these fiddle with my DB and the query How can I do this with SQLite? There's an extension on the ...
0
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0answers
10 views

Are there any known benchmarks/statistics on UnQLite?

I came across UnQLite the other day in Stack Overflow and it has me intrigued for some software I'm working on. However, very few tests have been published on how well it performs. There are plenty of ...
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0answers
19 views

SQLite insertion with junction table

I need to write a transaction for SQLite, that adds a blog post and links it to content tags, and it seems to be a bit too complicated for me. Here's an example schema: CREATE TABLE blogpost( ...
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0answers
30 views

How to divide a big SQL Query into small query

I am trying to traverse the whole file system. I am picking each and every file and then trying to insert it into the SQLite Database. Before inserting I am also calculating the checksum of each file. ...
0
votes
0answers
11 views

Help in Designing a CBT database

Please i need help in modifying or remaking the database so that i can mark answers to questions immediately. The problem is some courses have 50 questions, while others have 100. How can i design ...
0
votes
0answers
26 views

trying to a lag a column in SQLite

Sorry if this is too basic for this forum, but I have had no luck in StackOverflow. I am a newbie to SQL. I am using SQLite. I have a table where rows represent individuals in a point in time. I am ...
0
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0answers
27 views

Bitfield in Database

What is the best way to store a Bitfield of 960 values in a Sqlite3-Database? I need to do queries of testing if the x-bit is set.
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0answers
50 views

Options for fastest guaranteed writes to a SQLite Shared cache in memory database

I have a multi-threaded python process, and I am using SQLite to store data between the processes. The flow is as follows: Main process created named in memory database, and table within the ...
0
votes
0answers
34 views

SQLite 3 Tree List Without CTE

I adapted a SQL statement to work with SQLite 3. But unfortunately Common Table Expressions and WITH clause works only in SQLite 3.6 ahead, but the users of my Open Source application are using SQLite ...
0
votes
0answers
48 views

Unable to sort this table for the specified condition in SQLite

I have this table given below with the following details. I am trying to sort this table on a specific way. Here's a sample screen shot of the table. Following is the table structure: Table ...
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0answers
55 views

Insert values from one database table to other database table through shell scripting

I am working with 2 databases say logdb.db and logdb2.db . I have created a table named Original in logdb.db Sqlite database such as follows : CREATE TABLE Original (s_id INT PRIMARY KEY NOT NULL ...
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0answers
44 views

Continuously copying an SQLite table

I have a SQLite database associated with an online application (Skype) on my computer, which is often changed by that application when I am using Internet. These are the columns of the database: ...
0
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0answers
57 views

Understanding SQLite filesize, size “always” 1.471.488 bytes

We store some Data in a zipped SQLite file. Basically it's 7 tables, 6 of fixed size and one table varies. The table has only 3 fields, which contain the date and 2 small integers. Example: ...
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0answers
100 views

insert record to child table which doesn't map to parent table - possible?

Actually I've 2 relevant questions: insert record to child table which doesn't map to parent table - possible? ON DELETE NO ACTION - when a record in parent table is deleted, it should affect ...
0
votes
0answers
19 views

Unable to open MONyogs

I was trying to run through the docs for manually working with the MONyog internal sqlite dbs for purposes of configuration automation. At the point trying to open the data file I get an error $ ...
0
votes
0answers
17 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 ...
0
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0answers
27 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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0answers
944 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 ...
0
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0answers
1k 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 ...
0
votes
0answers
1k 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
votes
0answers
965 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 ...
0
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0answers
466 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 ...