{"id":41560,"date":"2023-04-18T19:09:30","date_gmt":"2023-04-03T05:52:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-join-%e7%9a%84%e7%b1%bb%e5%9e%8b\/"},"modified":"2024-04-30T00:08:15","modified_gmt":"2024-04-29T16:08:15","slug":"postgresql-join-%e7%9a%84%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-join-%e7%9a%84%e7%b1%bb%e5%9e%8b\/","title":{"rendered":"[PostgreSQL] JOIN \u7684\u7c7b\u578b"},"content":{"rendered":"

\u4f5c\u4e3a\u5907\u5fd8\u5f55\uff0c\u6709\u65f6\u4f1a\u7ea0\u7ed3\u4f7f\u7528\u54ea\u4e2a\u9009\u9879\u3002
\n\u8fdb\u884c\u9a8c\u8bc1\u65f6\u4f7f\u7528\u7684Postgres\u7248\u672c\u662f12.7\u3002<\/p>\n

\u524d\u63d0 t\u00ed)<\/h3>\n

\u4f7f\u7528\u4ee5\u4e0b\u8868\u5b9a\u4e49\u548c\u6570\u636e\u8fdb\u884c\u9a8c\u8bc1\u3002<\/p>\n

CREATE<\/span> TABLE<\/span> companies<\/span>(<\/span>\r\n  id<\/span> bigint<\/span> primary<\/span> key<\/span>,<\/span> \r\n  name<\/span> varchar<\/span>(<\/span>50<\/span>)<\/span> NOT<\/span> NULL<\/span>,<\/span>\r\n  tel<\/span> varchar<\/span>(<\/span>50<\/span>)<\/span>\r\n);<\/span>\r\n\r\nCREATE<\/span> TABLE<\/span> employees<\/span>(<\/span>\r\n  id<\/span> bigint<\/span> primary<\/span> key<\/span>,<\/span> \r\n  company_id<\/span> bigint<\/span>,<\/span>\r\n  name<\/span> varchar<\/span>(<\/span>50<\/span>)<\/span> NOT<\/span> NULL<\/span>,<\/span>\r\n  age<\/span> integer<\/span>,<\/span>\r\n  FOREIGN<\/span> KEY<\/span> (<\/span>company_id<\/span>)<\/span> references<\/span> companies<\/span>(<\/span>id<\/span>)<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> public<\/span>.<\/span>companies<\/span>(<\/span>id<\/span>,<\/span> name<\/span>,<\/span> tel<\/span>)<\/span>\r\nVALUES<\/span> \r\n    (<\/span>1<\/span>,<\/span> '\u682a\u5f0f\u4f1a\u793e\u307b\u3052'<\/span>,<\/span> '00-0000-0000'<\/span>),<\/span>\r\n    (<\/span>2<\/span>,<\/span> '\u682a\u5f0f\u4f1a\u793e\u3075\u304c'<\/span>,<\/span> '00-0000-1111'<\/span>),<\/span>\r\n    (<\/span>3<\/span>,<\/span> '\u682a\u5f0f\u4f1a\u793e\u3074\u3088'<\/span>,<\/span> '00-0000-2222'<\/span>);<\/span>\r\n\r\n\r\nINSERT<\/span> INTO<\/span> public<\/span>.<\/span>employees<\/span>(<\/span>id<\/span>,<\/span> company_id<\/span>,<\/span> name<\/span>,<\/span> age<\/span>)<\/span>\r\nVALUES<\/span> \r\n    (<\/span>1<\/span>,<\/span> 1<\/span>,<\/span> '\u30c6\u30b9\u30c8\u592a\u90ce'<\/span>,<\/span> 25<\/span>),<\/span>\r\n    (<\/span>2<\/span>,<\/span> 1<\/span>,<\/span> '\u30c6\u30b9\u30c8\u6b21\u90ce'<\/span>,<\/span> 20<\/span>),<\/span>\r\n    (<\/span>3<\/span>,<\/span> 2<\/span>,<\/span> '\u30c6\u30b9\u30c8\u4e09\u90ce'<\/span>,<\/span> 30<\/span>),<\/span>\r\n    (<\/span>4<\/span>,<\/span> null<\/span>,<\/span> '\u30c6\u30b9\u30c8\u4e94\u90ce'<\/span>,<\/span> 40<\/span>);<\/span>\r\n<\/code><\/pre>\n
\uff08\u5185\u90e8\uff09\u8fde\u63a5<\/h3>\n
\u53ea\u663e\u793a\u7b26\u5408\u8054\u63a5\u6761\u4ef6\uff08ON\uff09\u7684\u8bb0\u5f55\u3002<\/p>\n
SELECT<\/span> \r\n    e<\/span>.<\/span>id<\/span> AS<\/span> employee_id<\/span>,<\/span> \r\n    e<\/span>.<\/span>name<\/span> AS<\/span> employee_name<\/span>,<\/span> \r\n    c<\/span>.<\/span>id<\/span> AS<\/span> company_id<\/span>,<\/span> \r\n    c<\/span>.<\/span>name<\/span> AS<\/span> company_name<\/span>\r\nFROM<\/span> employees<\/span> e<\/span>\r\nJOIN<\/span> companies<\/span> c<\/span> ON<\/span> c<\/span>.<\/span>id<\/span> =<\/span> e<\/span>.<\/span>company_id<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c –<\/p>\n
\n
employee_idemployee_namecompany_idcompany_name1\u30c6\u30b9\u30c8\u592a\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30522\u30c6\u30b9\u30c8\u6b21\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30523\u30c6\u30b9\u30c8\u4e09\u90ce2\u682a\u5f0f\u4f1a\u793e\u3075\u304c<\/div>\n<\/div>\n
\u5de6\uff08\u5916\uff09\u8fde\u63a5<\/h3>\n
\u5de6\u5916\u90e8\u7d50\u5408\u610f\u5473\u8457\uff0c\u4f1a\u663e\u793a\u6240\u6709\u5de6\u8868(FROM\u6307\u5b9a\u7684\u8868\u683c)\uff0c
\n\u5bf9\u4e8e\u4e0d\u80fd\u5339\u914d\u5230\u7d50\u5408\u6761\u4ef6\u7684\u53f3\u8868(JOIN\u6307\u5b9a\u7684\u8868\u683c)\u4f1a\u4ee5NULL\u7684\u5f62\u5f0f\u8fdb\u884c\u7d50\u5408\u3002<\/p>\n
SELECT<\/span> \r\n    e<\/span>.<\/span>id<\/span> AS<\/span> employee_id<\/span>,<\/span> \r\n    e<\/span>.<\/span>name<\/span> AS<\/span> employee_name<\/span>,<\/span> \r\n    c<\/span>.<\/span>id<\/span> AS<\/span> company_id<\/span>,<\/span> \r\n    c<\/span>.<\/span>name<\/span> AS<\/span> company_name<\/span>\r\nFROM<\/span> employees<\/span> e<\/span>\r\nLEFT<\/span> JOIN<\/span> companies<\/span> c<\/span> ON<\/span> c<\/span>.<\/span>id<\/span> =<\/span> e<\/span>.<\/span>company_id<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
\n
employee_idemployee_namecompany_idcompany_name1\u30c6\u30b9\u30c8\u592a\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30522\u30c6\u30b9\u30c8\u6b21\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30523\u30c6\u30b9\u30c8\u4e09\u90ce2\u682a\u5f0f\u4f1a\u793e\u3075\u304c4\u30c6\u30b9\u30c8\u4e94\u90ce<\/p>\n<\/div>\n<\/div>\n
\u53f3\u5916\u8fde\u63a5<\/h3>\n
\u53f3\u5916\u90e8\u7d50\u5408\u7684\u610f\u601d\u662f\u5c06\u53f3\u8868\uff08\u901a\u8fc7JOIN\u6307\u5b9a\u7684\u8868\uff09\u7684\u6240\u6709\u8bb0\u5f55\u663e\u793a\u51fa\u6765\uff0c\u5e76\u4e14\u5c06\u4e0d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5de6\u8868\uff08\u901a\u8fc7FROM\u6307\u5b9a\u7684\u8868\uff09\u8bbe\u7f6e\u4e3aNULL\u8fdb\u884c\u8fde\u63a5\u3002<\/p>\n
SELECT<\/span> \r\n    e<\/span>.<\/span>id<\/span> AS<\/span> employee_id<\/span>,<\/span> \r\n    e<\/span>.<\/span>name<\/span> AS<\/span> employee_name<\/span>,<\/span> \r\n    c<\/span>.<\/span>id<\/span> AS<\/span> company_id<\/span>,<\/span> \r\n    c<\/span>.<\/span>name<\/span> AS<\/span> company_name<\/span>\r\nFROM<\/span> companies<\/span> c<\/span>\r\nRIGHT<\/span> JOIN<\/span> employees<\/span> e<\/span> ON<\/span> e<\/span>.<\/span>company_id<\/span> =<\/span> c<\/span>.<\/span>id<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
LEFT JOIN\u7684\u4e2d\u6587\u610f\u601d\u662f\u300c\u5de6\u8054\u7ed3\u300d\u3002<\/p>\n
\u5168\uff08\u5916\uff09\u8fde\u63a5<\/h3>\n
\u5b8c\u5168\u5916\u90e8\u8054\u63a5\u3002
\n\u5c06\u5de6\u8054\u63a5\u548c\u53f3\u8054\u63a5\u7684\u7ed3\u679c\u5408\u5e76\u5728\u4e00\u8d77\u3002<\/p>\n
SELECT<\/span> \r\n    e<\/span>.<\/span>id<\/span> AS<\/span> employee_id<\/span>,<\/span> \r\n    e<\/span>.<\/span>name<\/span> AS<\/span> employee_name<\/span>,<\/span> \r\n    c<\/span>.<\/span>id<\/span> AS<\/span> company_id<\/span>,<\/span> \r\n    c<\/span>.<\/span>name<\/span> AS<\/span> company_name<\/span>\r\nFROM<\/span> employees<\/span> e<\/span>\r\nFULL<\/span> JOIN<\/span> companies<\/span> c<\/span> ON<\/span> c<\/span>.<\/span>id<\/span> =<\/span> e<\/span>.<\/span>company_id<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c (ji\u00e9 gu\u01d2)<\/p>\n
\n
employee_idemployee_namecompany_idcompany_name1\u30c6\u30b9\u30c8\u592a\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30522\u30c6\u30b9\u30c8\u6b21\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30523\u30c6\u30b9\u30c8\u4e09\u90ce2\u682a\u5f0f\u4f1a\u793e\u3075\u304c4\u30c6\u30b9\u30c8\u4e94\u90ce<\/p>\n
3\u682a\u5f0f\u4f1a\u793e\u3074\u3088<\/p><\/div>\n<\/div>\n
\u7b1b\u5361\u5c14\u79ef<\/h3>\n
\u63d0\u53d6\u4e24\u4e2a\u8868\u7684\u6240\u6709\u8bb0\u5f55\uff0c\u5e76\u663e\u793a\u6240\u6709\u7ec4\u5408\u3002<\/p>\n
SELECT<\/span> \r\n    e<\/span>.<\/span>id<\/span> AS<\/span> employee_id<\/span>,<\/span> \r\n    e<\/span>.<\/span>name<\/span> AS<\/span> employee_name<\/span>,<\/span> \r\n    c<\/span>.<\/span>id<\/span> AS<\/span> company_id<\/span>,<\/span> \r\n    c<\/span>.<\/span>name<\/span> AS<\/span> company_name<\/span>\r\nFROM<\/span> employees<\/span> e<\/span>\r\nCROSS<\/span> JOIN<\/span> companies<\/span> c<\/span>\r\nORDER<\/span> BY<\/span> e<\/span>.<\/span>id<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c (ji\u00e9 gu\u01d2)<\/p>\n
\n
employee_idemployee_namecompany_idcompany_name1\u30c6\u30b9\u30c8\u592a\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30521\u30c6\u30b9\u30c8\u592a\u90ce2\u682a\u5f0f\u4f1a\u793e\u3075\u304c1\u30c6\u30b9\u30c8\u592a\u90ce3\u682a\u5f0f\u4f1a\u793e\u3074\u30882\u30c6\u30b9\u30c8\u6b21\u90ce1\u682a\u5f0f\u4f1a\u793e\u307b\u30522\u30c6\u30b9\u30c8\u6b21\u90ce2\u682a\u5f0f\u4f1a\u793e\u3075\u304c2\u30c6\u30b9\u30c8\u6b21\u90ce3\u682a\u5f0f\u4f1a\u793e\u3074\u3088…………<\/div>\n<\/div>\n
\u4ee5\u4e0b\u4e3a\u53c2\u7167\uff1a<\/h3>\n
\u4f9d\u7167
\n\u6839\u636e
\n\u6309\u7167
\n\u53c2\u8003<\/p>\n
    \n
  • \n
      PostgreSQL 12.4\u6587\u66f8 7.2. \u30c6\u30fc\u30d6\u30eb\u5f0f<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u300c\u5206\u304b\u308a\u305d\u3046\u300d\u3067\u300c\u5206\u304b\u3089\u306a\u3044\u300d\u3067\u3082\u300c\u5206\u304b\u3063\u305f\u300d\u6c17\u306b\u306a\u308c\u308bIT\u7528\u8a9e\u8f9e\u5178<\/ul>\n","protected":false},"excerpt":{"rendered":"
        \u4f5c\u4e3a\u5907\u5fd8\u5f55\uff0c\u6709\u65f6\u4f1a\u7ea0\u7ed3\u4f7f\u7528\u54ea\u4e2a\u9009\u9879\u3002 \u8fdb\u884c\u9a8c\u8bc1\u65f6\u4f7f\u7528\u7684Postgres\u7248\u672c\u662f12.7\u3002 \u524d\u63d0 t\u00ed) \u4f7f\u7528\u4ee5\u4e0b […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41560","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n[PostgreSQL] JOIN \u7684\u7c7b\u578b - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-join-\u7684\u7c7b\u578b\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[PostgreSQL] JOIN \u7684\u7c7b\u578b\" \/>\n<meta property=\"og:description\" content=\"\u4f5c\u4e3a\u5907\u5fd8\u5f55\uff0c\u6709\u65f6\u4f1a\u7ea0\u7ed3\u4f7f\u7528\u54ea\u4e2a\u9009\u9879\u3002 \u8fdb\u884c\u9a8c\u8bc1\u65f6\u4f7f\u7528\u7684Postgres\u7248\u672c\u662f12.7\u3002 \u524d\u63d0 t\u00ed) \u4f7f\u7528\u4ee5\u4e0b […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-join-\u7684\u7c7b\u578b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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