sqlite3/ext/stats/TODO.md

ANSI SQL Aggregate Functions

https://www.oreilly.com/library/view/sql-in-a/9780596155322/ch04s02.html

Built in aggregates

• COUNT(*)
• COUNT(expression)
• SUM(expression)
• AVG(expression)
• MIN(expression)
• MAX(expression)

https://sqlite.org/lang_aggfunc.html

Statistical aggregates

• STDDEV_POP(expression)
• STDDEV_SAMP(expression)
• VAR_POP(expression)
• VAR_SAMP(expression)
• COVAR_POP(dependent, independent)
• COVAR_SAMP(dependent, independent)
• CORR(dependent, independent)

Linear regression aggregates

• REGR_AVGX(dependent, independent)
• REGR_AVGY(dependent, independent)
• REGR_SXX(dependent, independent)
• REGR_SYY(dependent, independent)
• REGR_SXY(dependent, independent)
• REGR_COUNT(dependent, independent)
• REGR_SLOPE(dependent, independent)
• REGR_INTERCEPT(dependent, independent)
• REGR_R2(dependent, independent)

Set aggregates

• CUME_DIST() OVER window
• RANK() OVER window
• DENSE_RANK() OVER window
• PERCENT_RANK() OVER window
• PERCENTILE_CONT(percentile) OVER window
• PERCENTILE_DISC(percentile) OVER window

https://sqlite.org/windowfunctions.html#builtins

Boolean aggregates

• ALL(boolean)
• ANY(boolean)
• EVERY(boolean)
• SOME(boolean)

Additional aggregates

• MEDIAN(expression)
• QUANTILE_CONT(expression, quantile)
• QUANTILE_DISC(expression, quantile)

https://duckdb.org/docs/sql/aggregates.html