.
I recommend Ken Ludwig’s How to Teach Your Children Shakespeare every chance I get. Only $1.99 for Kindle right now (although I admit I love my paperback copy). You can still find my original review on my old blog.
Q: percentage based on two columns So, I have this table:
| model | user_type  | count |
+-------+------------+-------+
| 2017  | member     | 42    |
| 2017  | occasional | 562   |
| 2017  | visitor    | 156   |
| 2018  | member     | 223   |
| 2018  | occasional | 2828  |
| 2018  | visitor    | 781   |
| 2019  | member     | 185   |
| 2019  | occasional | 2193  |
| 2019  | visitor    | 596   |
| 2020  | member     | 41    |
| 2020  | occasional | 244   |
| 2020  | visitor    | 54    |

and I would like to get this table:
| model | user_type  | count | percentage    |
|-------|------------|-------|---------------|
| 2017  | member     | 42    | 0.05526315789 |
| 2017  | occasional | 562   | 0.7394736842  |
| 2017  | visitor    | 156   | 0.2052631579  |
| 2018  | member     | 223   | 0.05819415449 |
| 2018  | occasional | 2828  | 0.7379958246  |
| 2018  | visitor    | 781   | 0.2038100209  |
| 2019  | member     | 185   | 0.06220578346 |
| 2019  | occasional | 2193  | 0.7373907196  |
| 2019  | visitor    | 596   | 0.200403497   |
| 2020  | member     | 41    | 0.1209439528  |
| 2020  | occasional | 244   | 0.7197640118  |
| 2020  | visitor    | 54    | 0.1592920354  |

Where the percentage is obtained by dividing count by the sum of count for a given year (the percentage on first row is: 42/(42+562+156) )

A: Simply use window functions:
select t.*,
       count * 1.0 / sum(count) over (partition by year) as ratio
from t;

The * 1.0 is just to convert the integer to a decimal of some sort for the division.

A: You can use window functions.
SELECT MODEL,user_type,count,
COUNT/SUM(COUNT) OVER(PARTITION BY MODEL ORDER BY MODEL)  AS percentage
FROM K1

Link to Fiddle

A: You just need to include a subquery.
SELECT
  model,
  user_type,
  count,
  count / (SELECT SUM(t2.count) FROM user_table t2 WHERE t1.model = t2.model) AS percentage
FROM user_table t1

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PROBLEM: Better Than Just "1980s Music". As ballad pop goes, Journey is there. These are the songs which were played at proms throughout the 1980s. Filled with romance, emotional passion and Steve Perry's unrelenting voice, Journey's "The Essential Journey" are a mix of hard, mild and melodic pop rock.     Occasionally, the band would turn out mediocre music, like "Girl Can't Help It," but most is still worth listening to. "Be Good to Yourself" sounds like a bad movie soundtrack song, and is not worthy of this otherwise amazing CD.    There are two disks, with more music than the average listener is familiar with, and only hardcore fans with know. A few hits are missing, leaving a real best-of CD still out there.    Journey was a pop band: Simple lyrics without a heavy message. Distinguishing them was their willingness to step out of the known musical formulas. Club music was coming into its own in the 1980s, with DJs sampling and mixing. Their music doesn't sample well, and they risked being a radio-only band. As their hit list grew from "Lovin' Touchin' Squeezin'" into a rich repertoire, their concerts became packed into stadiums. Those are the songs here.     It is 1980s music in every sense of the term, but better than just as music from the period, just like James Taylor is better than just being a musician from the 1970s. I fully recommend, "The Essential Journey" by Journey.     Anthony Trendl   editor, HungarianBookstore.co

SOLUTION: POS

PROBLEM: CARS SUCK, ACDC SUCK, BOSTON SUCK, AND STEVE MILLER SUCK. THE CARS HAVE TO BE ONE OF THE MOST OVERRATED BANDS OF ALL TIME.  THEY HAVE ONLY MADE 1 DECENT SONG IN BYE BYE LOVE. REST OF THEIR SONGS JUST PLAIN SUCK. I MEAN WHY DO PEOPLE LOVE LOUSY BANDS IN  QUEEN, CARS, ACDC, BEATLES, STONES, WHO, STEVE MILLER, AND BOSTON? GOOD BANDS ARE REQUIRED TO BE DIRE STRAITS, FOREIGNER, GUNS N' ROSES, NIRVANA, GREEN DAY, AEROSMITH, AND JOE WALSH.  DON'T READ THE 5 STAR REVIEWERS FOR THIS TERRIBLE COMPILATION. GO GET A BETTER ALBUM FROM NIRVANA INSTED.  PS THE CARS SUCK

SOLUTION: NEG

PROBLEM: Can't put it down. As another reviewer said. This may be the easiest CD to wear out in 10 days

SOLUTION:
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