I’m searching for a more efficient method to accomplish something that I’ve already solved with a few different SQL statements. The problem: I have two tables a transactions table, and an accounts table The transactions table has columns that look like: acct_sending acct_receiving amount tx_datetime 100 101 10 yyyy-mm-dd hh-mm-ss 101 100 5 yyyy-mm-dd hh-mm-ss 101 200 1 yyyy-mm-dd hh-mm-ss
How to create a trigger on table A that inserts/updates entity in table B?
I have tables TableAAA, TableBBB, TableCCC and TableCollected. The AAA/BBB/CCC tables have a DateTime column: I’d like to have a 1-1 trigger on each table that runs after inserting/updating. It should save the biggest DateTime from given table into the TableCollected table. So if TableAAA table contains 3 rows with dates 1980-01-01, 1990-01-01 and 2010-01-01 then in TableCollected I’d have
SQLite: optimize query with union
This is my table definition: And this is my query + plan: So the index is used, but there is still a scan and a b-tree involved in the order by. I tried getting rid of them by adding more indexes, but I don’t get it working. Any ideas of an index which gets rid of the scan? Answer Your
How would I make my SQL statement show only the first line (lowest price + total purchases)
I’ve got this SQL exercise I’m trying to complete but I can’t figure out how to specifically show one row that should contain the media type with the lowest # of purchases and purchase value. I’m completely unsure of what I should add after my ‘group by’? So this is what I want my output to be: https://i.stack.imgur.com/5biiM.png And this
Condition to SUM previous values – SQLite
My following SQLite database: Explaining brazilian tax income: a) if I have loss, I don’t need to pay any tax (e.g.: January) b) negative results can be subtracted from the next month positive outcome (e.g.: in February, instead of paying the full tax for $ 5942, the tax can be applied only to (5942 – 3200) = 2742. c) if
How to obtain recent date/time using MAX() function if I can not put it in the “where” clause in SQLite?
I am trying to select the recent date and time. I understand that I cannot use MAX() function in the where clause because it will not work. For my table 4, I do not want to use “GROUP BY” statement as I want to see all the ID’s. I tried using this code below but it gave me one row
Dynamanically add column(s) and insert values into a Sqlite TABLE from json objects
I am using the Python tweepy library to scrap and collect tweet data for a research purpose. Specifically is use tweepy.StreamingClient class to get tweet the from stream. Returned data is json object whose elements depends on the data fields available with retrieved tweet post. So for example, at one time I received json object with few elements like this:
How to separate everything inside my sqlite database
i have a database which has two thing in my database, name of a fruit and how long is it in the freezer. when i use rows will actually show the name of the fruit, time in freezer and the amount of fruit in batch How do i separate this, so that Or at least tell me how do i
How to access attached database’s tables using python’s sqlite3?
I am attempting to attach a second database to an sqlite3 connection to a database. However when I attempt to retrieve the tables from the connected database sqlite crashes as there is no such table. Even though the PRAGMA database_list sqlite command displays the connected database file, implying that the attachment was successful. Answer db_2_name’s value is a string that
SQLite: how to exclude records in a database with join tables?
I have a database with a schema similar to: Say they have the following data in them: Artists: artist_id artist_name 1 Bob 2 Shawn Songs: song_id song_name 1 one song 2 another song song_artist: song artist 1 1 1 2 2 2 Here, both Bob and Shawn are involved in one song, and only Shawn is involved in another song.