在PostgreSQL（PgSQL）中，分析函数（Aggregate Functions）用于对一组值进行汇总和计算
SELECT COUNT(*) FROM table_name;
SELECT SUM(column_name) FROM table_name;
SELECT AVG(column_name) FROM table_name;
SELECT MIN(column_name) FROM table_name;
SELECT MAX(column_name) FROM table_name;
SELECT STRING_AGG(column_name, delimiter) FROM table_name;
SELECT GROUP_CONCAT(column_name ORDER BY column_name SEPARATOR delimiter) FROM table_name;
SELECT RANK() OVER (ORDER BY column_name) AS rank FROM table_name;
SELECT DENSE_RANK() OVER (ORDER BY column_name) AS rank FROM table_name;
SELECT ROW_NUMBER() OVER (ORDER BY column_name) AS row_num FROM table_name;
这些只是PostgreSQL中可用的部分分析函数。要了解更多关于分析函数的信息，请参阅官方文档：https://www.postgresql.org/docs/current/functions-aggregate.html。
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