这篇文章主要介绍了postgresql 查询集合结果用逗号分隔返回字符串处理的操作，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧。
关键字：
1string_agg('' , '')
例如：
1select string_agg(name||'' , ',') from sys_user
补充：PostgreSQL 字段用逗号 “，”隔开 判断是否含有某个值
Array Functions and Operators
https://www.postgresql.org/docs/9.2/functions-array.html
— —————————-
— Table structure for T_STUDENT
— —————————-
DROP TABLE IF EXISTS "public"."T_STUDENT";
CREATE TABLE "public"."T_STUDENT" (
"id" int4,
"name" varchar(255) COLLATE "default",
"course" varchar(255) COLLATE "default"
)
WITH (OIDS=FALSE)
;
— —————————-
— Records of T_STUDENT
— —————————-
INSERT INTO "public"."T_STUDENT" VALUES ('1', '李四', '12,45,1,66,7,89');
INSERT INTO "public"."T_STUDENT" VALUES ('2', '刘一', '1,5,8,9');
INSERT INTO "public"."T_STUDENT" VALUES ('3', '王五', '0,4,2');
INSERT INTO "public"."T_STUDENT" VALUES ('4', '张三', '1,2,5,7');
— —————————-
— Alter Sequences Owned By
— —————————-
— —————————-
— Table structure for T_STUDENT
— —————————-
DROP TABLE IF EXISTS "public"."T_STUDENT";
CREATE TABLE "public"."T_STUDENT" (
"id" int4,
"name" varchar(255) COLLATE "default",
"course" varchar(255) COLLATE "default"
