{"id":12121,"date":"2018-12-01T13:25:29","date_gmt":"2018-12-01T12:25:29","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/postgresql-12-csv-output-format-for-psql\/"},"modified":"2018-12-01T13:25:29","modified_gmt":"2018-12-01T12:25:29","slug":"postgresql-12-csv-output-format-for-psql","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/postgresql-12-csv-output-format-for-psql\/","title":{"rendered":"PostgreSQL 12: csv output format for psql"},"content":{"rendered":"<p>Getting data out of PostgreSQL in csv format is not a big issue. Using <a href=\"https:\/\/www.postgresql.org\/docs\/current\/sql-copy.html\" target=\"_blank\" rel=\"noopener noreferrer\">copy<\/a> you can do that easily. PostgreSQL 12 will enhance psql so that you can directly return csv formatted output from a query.<\/p>\n<p><!--more--><\/p>\n<p>Using &#8220;copy&#8221; you would do something like this:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# copy pg_database to '\/var\/tmp\/aa.txt' with (format csv);\nCOPY 3\npostgres=# ! cat \/var\/tmp\/aa.txt\n11788,postgres,10,6,en_US.utf8,en_US.utf8,f,t,-1,11787,598,1,1663,\n1,template1,10,6,en_US.utf8,en_US.utf8,t,t,-1,11787,598,1,1663,\"{=c\/postgres,postgres=CTc\/postgres}\"\n11787,template0,10,6,en_US.utf8,en_US.utf8,t,f,-1,11787,598,1,1663,\"{=c\/postgres,postgres=CTc\/postgres}\"\npostgres=# \n<\/pre>\n<p>What you can not do directly with copy is dumping a view:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# copy pg_settings to '\/var\/tmp\/aa.txt' with (format csv);\nERROR:  cannot copy from view \"pg_settings\"\nHINT:  Try the COPY (SELECT ...) TO variant.\n<\/pre>\n<p>Of course you can workaround that by doing it like this:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# copy (select * from pg_settings) to '\/var\/tmp\/aa.txt' with (format csv);\nCOPY 309\npostgres=# ! head -2 \/var\/tmp\/aa.txt\nallow_system_table_mods,off,,Developer Options,Allows modifications of the structure of system tables.,,postmaster,bool,default,,,,off,off,,,f\napplication_name,psql,,Reporting and Logging \/ What to Log,Sets the application name to be reported in statistics and logs.,,user,string,client,,,,\"\",psql,,,f\n<\/pre>\n<p>With PostgreSQL 12 there will be an easier way of doing that:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# pset format csv\nOutput format is csv.\npostgres=# select * from pg_database;\noid,datname,datdba,encoding,datcollate,datctype,datistemplate,datallowconn,datconnlimit,datlastsysoid,datfrozenxid,datminmxid,dattablespace,datacl\n11788,postgres,10,6,en_US.utf8,en_US.utf8,f,t,-1,11787,598,1,1663,\n1,template1,10,6,en_US.utf8,en_US.utf8,t,t,-1,11787,598,1,1663,\"{=c\/postgres,postgres=CTc\/postgres}\"\n11787,template0,10,6,en_US.utf8,en_US.utf8,t,f,-1,11787,598,1,1663,\"{=c\/postgres,postgres=CTc\/postgres}\"\n<\/pre>\n<p>&#8230; or directly when executing psql:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgbox:\/home\/postgres\/ [PGDEV] psql -c \"select * from pg_database\" --csv  postgres\noid,datname,datdba,encoding,datcollate,datctype,datistemplate,datallowconn,datconnlimit,datlastsysoid,datfrozenxid,datminmxid,dattablespace,datacl\n11788,postgres,10,6,en_US.utf8,en_US.utf8,f,t,-1,11787,598,1,1663,NULL\n1,template1,10,6,en_US.utf8,en_US.utf8,t,t,-1,11787,598,1,1663,\"{=c\/postgres,postgres=CTc\/postgres}\"\n11787,template0,10,6,en_US.utf8,en_US.utf8,t,f,-1,11787,598,1,1663,\"{=c\/postgres,postgres=CTc\/postgres}\"\nTime: 0.794 ms\n<\/pre>\n<p>This makes is very easy to pass the data to other programs for further processing. You even specify the field separator:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgbox:\/home\/postgres\/ [PGDEV] psql -c \"select * from pg_database\" --csv -P csv_fieldsep='#'  postgres\noid#datname#datdba#encoding#datcollate#datctype#datistemplate#datallowconn#datconnlimit#datlastsysoid#datfrozenxid#datminmxid#dattablespace#datacl\n11788#postgres#10#6#en_US.utf8#en_US.utf8#f#t#-1#11787#598#1#1663#NULL\n1#template1#10#6#en_US.utf8#en_US.utf8#t#t#-1#11787#598#1#1663#{=c\/postgres,postgres=CTc\/postgres}\n11787#template0#10#6#en_US.utf8#en_US.utf8#t#f#-1#11787#598#1#1663#{=c\/postgres,postgres=CTc\/postgres}\n(3 rows)\nTime: 2.105 ms\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Getting data out of PostgreSQL in csv format is not a big issue. Using copy you can do that easily. PostgreSQL 12 will enhance psql so that you can directly return csv formatted output from a query.<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[77],"type_dbi":[],"class_list":["post-12121","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-postgresql"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>PostgreSQL 12: csv output format for psql - dbi Blog<\/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.dbi-services.com\/blog\/postgresql-12-csv-output-format-for-psql\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL 12: csv output format for psql\" \/>\n<meta property=\"og:description\" content=\"Getting data out of PostgreSQL in csv format is not a big issue. 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