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# 5 支持函数

点击相应函数组查看详细信息.

| 函数组 | <   | 函数 |
|-|----------|----------------------------------------|
| [Aggregate functions](/manual/appendix/functions/aggregate) | <   | avg, bucket\_percentile, count, histogram\_quantile, 监控项\_count, kurtosis, mad, max, min, skewness, stddevpop, stddevsamp, sum, sumofsquares, varpop, varsamp |
|                | [Foreach functions](/manual/appendix/functions/aggregate/foreach) | avg\_foreach, bucket\_rate\_foreach, count\_foreach, exists\_foreach, last\_foreach, max\_foreach, min\_foreach, sum\_foreach |
| [Bitwise functions](/manual/appendix/functions/bitwise) | <   | bitand, bitlshift, bitnot, bitor, bitrshift, bitxor |
| [Date and time functions](/manual/appendix/functions/time) | <   | date, dayofmonth, dayofweek, now, time |
| [History functions](/manual/appendix/functions/history) | <   | change, changecount, count, countunique, find, first, fuzzytime, last, logeventid, logseverity, logsource, monodec, monoinc, nodata, percentile, rate |
| [Trend functions](/manual/appendix/functions/trends) | <   | baselinedev, baselinewma, trendavg, trendcount, trendmax, trendmin, trendstl, trendsum |
| [Mathematical functions](/manual/appendix/functions/math) | <   | abs, acos, asin, atan, atan2, avg, cbrt, ceil, cos, cosh, cot, degrees, e, exp, expm1, floor, log, log10, max, min, mod, pi, power, radians, rand, round, signum, sin, sinh, sqrt, sum, tan, truncate |
| [Operator functions](/manual/appendix/functions/operator) | <   | between, in |
| [Prediction functions](/manual/appendix/functions/prediction) | <   | forecast, timeleft |
| [String functions](/manual/appendix/functions/string) | <   | ascii, bitlength, bytelength, char, concat, insert, left, length, ltrim, mid, repeat, replace, right, rtrim, trim |

这些函数在[trigger
expressions](/manual/config/triggers/expression)和[calculated
items](/manual/config/items/itemtypes/calculated)中受支持.

Foreach函数仅支持[aggregate calculations](/manual/config/items/itemtypes/calculated/aggregate).

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