edb=# SELECT MEDIAN (SAL), PERCENTILE_CONT(0.5) WITHIN GROUP(ORDER BY SAL) FROM emp; Output median | percentile_cont ---+--- 1250 | 1250 (1 row) STATS_MODE The STATS_MODE function takes a set of values as an argument and returns the value that occurs with the highest fr...
?...当然,有些需求并不能完全由一般的SQL函数实现。 ? 02 计算分位数如果数据的分布存在较大的偏斜,平均值并不能告诉我们平均等待时间的分布情况。...对于不支持percentile_cont的数据库,命令会更复杂一些,但仍然可以实现。主要问题是如何将每天的订单各自按等待时间递增的顺序排序,然后取...
DYNAMIC_FUNCTION非保留非保留非保留 DYNAMIC_FUNCTION_CODE非保留非保留 EACH非保留保留保留 ELEMENT保留 ELSE保留
Optimizing Your Database: A Deep Dive into PostgreSQL Data TypesHow to Install PostgreSQL on LinuxHow to Install PostgreSQL on MacOSUnderstanding percentile_cont() and percentile_disc() in PostgreSQLUsing PostgreSQL UPDATE With JOINUnderstanding PostgreSQL Conditional FunctionsUnderstanding PostgreSQL Array Fu...
Just likearray_to_percentile, but you can pass several percentiles and get the result for each in a single call. FLOAT[] sorted_array_to_percentiles(values T[], percentiles FLOAT[]) Just likearray_to_percentiles, but assumesvaluesis already sorted. ...
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