关键字：
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string_agg('' , '') |
例如：
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select 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
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-- ------------------------------ 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")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 -- ----------------------------id name course4 张三 1,2,5,71 李四 12,45,1,5,66,7,892 刘一 1,5,8,93 王五 0,4,2SELECT * FROM "public"."T_STUDENT" WHERE string_to_array(course, ',') @> ARRAY['2','7']结果：id name course4 张三 1,2,5,7SELECT * FROM "public"."T_STUDENT" WHERE string_to_array(course, ',') <@ array['5','12','45','1','0','4','2']结果：id name course3 王五 0,4,2SELECT * FROM "public"."T_STUDENT" WHERE string_to_array(course, ',') && ARRAY['5','8','225','111']结果：id name course4 张三 1,2,5,72 刘一 1,5,8,9 |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。如有错误或未考虑完全的地方，望不吝赐教。
原文链接：https://blog.csdn.net/dbsjack/article/details/80745922
