sql - Any way to "shortcut" common joins or code blocks in MySQL? -


i have tables in normalized forms (i've started learning this, wildly guess i'm using 3rd normal form know i'm wrong, know of example code horribly written , potentially wrong), , there few common joins use across several queries.

for illustration's sake, let's have information on songs, this:

songs: song_id (pk) | song_title | first_artist | most_famous_artist  albums: album_id (pk) | album_title | version | format | year_released  song versions: song_version_id (pk) | song_id (fk) | artist | year_released  album tracks: album_id (pk, fk) | track_no (pk) | song_version_id (fk)

and suppose pulling information on particular version of song, including name of song , album appeared on, keep writing:

from  song_versions sv  inner join songs s on sv.song_id = s.song_id  inner join album_tracks @ on at.song_version_id = sv.song_version_id  inner join albums on a.album_id = at.album_id

or whatever case may be. know denormalize bit, , either combine couple of tables or have data duplicated across tables , make sure keep them consistent. there way keep data structure same, have shortcut refer combination of song/version/album without having write same join time? (especially if may want refer particular subsets of same join - e.g. albums containing famous version of particular song, or songs have appeared on album released after 2000.)


Comments

Post a Comment

Popular posts from this blog

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more