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 course 4 张三 1,2,5,7 1 李四 12,45,1,5,66,7,89 2 刘一 1,5,8,9 3 王五 0,4,2 SELECT * FROM "public" . "T_STUDENT" WHERE string_to_array(course, ',' ) @> ARRAY[ '2' , '7' ] 结果： id name course 4 张三 1,2,5,7 SELECT * FROM "public" . "T_STUDENT" WHERE string_to_array(course, ',' ) <@ array[ '5' , '12' , '45' , '1' , '0' , '4' , '2' ] 结果： id name course 3 王五 0,4,2 SELECT * FROM "public" . "T_STUDENT" WHERE string_to_array(course, ',' ) && ARRAY[ '5' , '8' , '225' , '111' ] 结果： id name course 4 张三 1,2,5,7 2 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
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