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sqlite3/ext/stats/TODO.md
2025-06-08 00:38:01 +01:00

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# ANSI SQL Aggregate Functions
https://oreilly.com/library/view/sql-in-a/9780596155322/ch04s02.html
## Built in aggregates
- [x] `COUNT(*)`
- [x] `COUNT(expression)`
- [x] `SUM(expression)`
- [x] `AVG(expression)`
- [x] `MIN(expression)`
- [x] `MAX(expression)`
https://sqlite.org/lang_aggfunc.html
## Statistical aggregates
- [x] `STDDEV_POP(expression)`
- [x] `STDDEV_SAMP(expression)`
- [x] `VAR_POP(expression)`
- [x] `VAR_SAMP(expression)`
- [x] `COVAR_POP(dependent, independent)`
- [x] `COVAR_SAMP(dependent, independent)`
- [x] `CORR(dependent, independent)`
## Linear regression aggregates
- [X] `REGR_AVGX(dependent, independent)`
- [X] `REGR_AVGY(dependent, independent)`
- [X] `REGR_SXX(dependent, independent)`
- [X] `REGR_SYY(dependent, independent)`
- [X] `REGR_SXY(dependent, independent)`
- [X] `REGR_COUNT(dependent, independent)`
- [X] `REGR_SLOPE(dependent, independent)`
- [X] `REGR_INTERCEPT(dependent, independent)`
- [X] `REGR_R2(dependent, independent)`
## Set aggregates
- [X] `CUME_DIST() OVER window`
- [X] `RANK() OVER window`
- [X] `DENSE_RANK() OVER window`
- [X] `PERCENT_RANK() OVER window`
https://sqlite.org/windowfunctions.html#builtins
## Boolean aggregates
- [X] `EVERY(boolean)`
- [X] `SOME(boolean)`
## Additional aggregates
- [X] `MEDIAN(expression)`
- [X] `PERCENTILE_CONT(expression, fraction)`
- [X] `PERCENTILE_DISC(expression, fraction)`