{"id":1056,"date":"2018-07-25T19:41:26","date_gmt":"2018-07-25T19:41:26","guid":{"rendered":"http:\/\/dbtut.com\/?p=1056"},"modified":"2018-11-08T13:50:19","modified_gmt":"2018-11-08T13:50:19","slug":"how-to-create-a-view-on-postgresql","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/07\/25\/how-to-create-a-view-on-postgresql\/","title":{"rendered":"How To Create a View On PostgreSQL"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>In PostgreSQL, views are logical tables.<\/p>\n<p>By turning queries into views we can use complex queries with a simple select statement.<\/p>\n<p>For example, if you put a query that joins several tables into a view with view_x name, you can query this view with the following script.<\/p>\n<pre class=\"lang:default decode:true \">SELECT * FROM view_x;<\/pre>\n<p>&nbsp;<\/p>\n<p>Thus, by running a complex query with a simple select expression, you reduce the complexity of the application.<\/p>\n<p>We talked about the fact that the data are not physically stored in the views.<\/p>\n<p>If you want to keep the data physically in view, you should create a materialized view.<\/p>\n<p>For more detailed information on materialized views, you may want to read the article entitled &#8220;<a href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\" target=\"_blank\" rel=\"noopener\">How To Create a Materialized View On PostgreSQL<\/a>&#8220;.<\/p>\n<p>Below is a simple example of using views.<\/p>\n<p>First, we create a table with the help of the following script.<\/p>\n<pre class=\"lang:default decode:true\">CREATE TABLE table_example (name VARCHAR(50));<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/225.png\" width=\"506\" height=\"70\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>We then add a record to this table with the help of the following script and then query the table to check it later.<\/p>\n<pre class=\"lang:default decode:true\">INSERT INTO table_example VALUES('Nurullah Cakir');<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/582.png\" width=\"589\" height=\"184\" \/><\/p>\n<p>&nbsp;<\/p>\n<p lang=\"en-US\">Then we create a view that queries this table with the help of the following script.<\/p>\n<pre class=\"lang:default decode:true\">CREATE VIEW view_example AS select * from table_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/198.png\" width=\"583\" height=\"75\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>You can then query the view as follows.<\/p>\n<pre class=\"lang:default decode:true\">select * from view_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/895.png\" width=\"342\" height=\"129\" \/><\/p>\n<p>&nbsp;<\/p>\n<h4>How do we alter views?<\/h4>\n<p>First, let&#8217;s add a column to the table.<\/p>\n<pre class=\"lang:default decode:true\">ALTER TABLE table_example ADD COLUMN city VARCHAR(50);<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/736.png\" width=\"595\" height=\"70\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Later we will update the table to fill in the column we added.<\/p>\n<pre class=\"lang:default decode:true\">UPDATE table_example SET city='NEWYORK' WHERE name='Nurullah Cakir';<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/766.png\" width=\"636\" height=\"70\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Let&#8217;s check the contents of the view again with the following select script.<\/p>\n<pre class=\"lang:default decode:true\">select * from view_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/200.png\" width=\"388\" height=\"101\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>The city column did not come as you see it.<\/p>\n<p>Because there was no such column when we created the view.<\/p>\n<p>Now we update the view with the following script and then check again.<\/p>\n<pre class=\"lang:default decode:true\">CREATE OR REPLACE VIEW view_example AS select * from table_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/684.png\" width=\"595\" height=\"66\" \/><\/p>\n<p>&nbsp;<\/p>\n<pre class=\"lang:default decode:true\">select * from view_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/257-1.png\" width=\"381\" height=\"103\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Let&#8217;s try to delete a column from the View.<\/p>\n<pre class=\"lang:default decode:true\">CREATE OR REPLACE VIEW view_example AS Select name from table_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/625.png\" width=\"547\" height=\"49\" \/><\/p>\n<p>&nbsp;<\/p>\n<p lang=\"en-US\">We got an error like you saw it. &#8220;can not drop columns from view&#8221;<\/p>\n<p><span lang=\"en-US\">You can delete and <\/span><span lang=\"tr\">recreate <\/span><span lang=\"en-US\">the view as follows.<\/span><\/p>\n<pre class=\"lang:default decode:true\">DROP VIEW view_example;<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/797.png\" width=\"336\" height=\"68\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>You may want to look at the following articles about Views.<\/p>\n<p>&#8220;<a href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\" target=\"_blank\" rel=\"noopener\">How To Create a Materialized View On PostgreSQL<\/a>&#8220;,<\/p>\n<p>&#8220;<a href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/27\/how-to-create-a-recursive-view-on-postgresql\/\" target=\"_blank\" rel=\"noopener\">How To Create a Recursive View On PostgreSQL<\/a>&#8220;,<\/p>\n<p>&#8220;<a href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/30\/how-to-create-an-updateable-view-on-postgresql\/\" target=\"_blank\" rel=\"noopener\">How To Create an Updateable View On PostgreSQL<\/a>&#8220;,<\/p>\n<p>&#8220;<a href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/31\/how-to-create-an-updateable-view-with-check-option-on-postgresql\/\" target=\"_blank\" rel=\"noopener\">How To Create an Updateable View WITH CHECK CONSTRAINT On PostgreSQL<\/a>&#8220;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1056\" class=\"pvc_stats all  \" data-element-id=\"1056\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" 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By turning queries into views we can use complex queries with a simple select statement. For example, if you put a query that joins several tables into a view with view_x name, you can query this view with the following script. SELECT * FROM view_x; &nbsp; Thus, by &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1056\" class=\"pvc_stats all  \" data-element-id=\"1056\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[5],"tags":[1172,1177,1178,1171,1170,1174,1175,1176,1173],"class_list":["post-1056","post","type-post","status-publish","format-standard","","category-postgres","tag-alter-view-on-postgresql","tag-can-not-drop-columns-from-view","tag-create-or-replace-view","tag-create-view-on-postgresql","tag-drop-view-on-postgresql","tag-materialized-views-on-postgresql","tag-recursive-views-on-postgresql","tag-updateable-views-on-postgresql","tag-views-on-postgresql"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":211,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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