摘要： 一.字符串聚合需求如下。CREATE TABLE dbo.Groups( groupid VARCHAR(10) NOT NULL, memberid INT NOT NULL, string VARCHAR(10) NOT NULL, val INT NOT NULL, PRIMARY KEY (groupid, memberid));GO INSERT INTO dbo.Groups(groupid, memberid, string, val) VALUES ('a', 3, 'stra1', 6), ('a', 9, 'stra2 阅读全文