关键字:
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string_agg( '' , '' )
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例如:
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select string_agg( name || '' , ',' ) from sys_user
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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
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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