{"id":12985,"date":"2018-04-12T06:28:45","date_gmt":"2018-04-12T06:28:45","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=12985"},"modified":"2021-05-09T13:10:56","modified_gmt":"2021-05-09T07:40:56","slug":"impala-alter-view-statement","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/impala-alter-view-statement\/","title":{"rendered":"Impala ALTER VIEW Statement – How to Alter a View"},"content":{"rendered":"

In our last Impala Tutorial, we saw Create<\/strong> & Drop View Statements<\/strong>. Here, we are going to discuss Impala Alter View Statement. It helps to change the query associated with a view in Impala<\/strong>.<\/p>\n

Moreover, we will discuss the whole concept of\u00a0 Impala ALTER VIEW from its introduction, syntax, type as well as its example, to understand it well.<\/p>\n

So, let’s start Impala Alter View Statements.<\/p>\n

Impala ALTER VIEW Statement<\/span><\/h2>\n

Impala ALTER VIEW Statement changes the query associated with a view, or the associated database and\/or name of the view in Impala.\u00a0<\/span><\/em><\/p>\n

However, ALTER VIEW only involves changes to metadata in the Metastore database, because a view is purely a logical construct (an alias for a query) with no physical data behind it, not any data files in HDFS.<\/span><\/p>\n

a. Syntax for Alter View Statement<\/span><\/h3>\n

So, the syntax for using ALTER VIEW Statement in Impala is-<\/span>
\n<\/span><\/p>\n

ALTER VIEW [database_name.]view_name AS select_statement\nALTER VIEW [database_name.]view_name RENAME TO [database_name.]view_name\n<\/pre>\n
b. Statement type<\/span><\/h3>\n
Impala ALTER VIEW Statement is of DDL Type.<\/span><\/p>\n
Examples – Impala Alter View Statement<\/span><\/h2>\n
Let’s take an example of Impala alter a view,
\n<\/span>
\n<\/span>Let us suppose we have a table named <\/span>Employees<\/b> in the database my_db. Its contents are<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
name<\/b><\/td>\nage<\/b><\/td>\n<\/tr>\n
shubham<\/b><\/td>\n32<\/b><\/td>\n<\/tr>\n
monika<\/b><\/td>\n25<\/b><\/td>\n<\/tr>\n
kajal<\/b><\/td>\n27<\/b><\/td>\n<\/tr>\n
revti<\/b><\/td>\n25<\/b><\/td>\n<\/tr>\n
shreyash<\/b><\/td>\n23<\/b><\/td>\n<\/tr>\n
mehul<\/b><\/td>\n22<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
So, here is an example of the Impala Alter View Statement. Basically, using the Alter View Statement, we are including the columns id, name, and salary instead of name and age to the <\/span>Employees<\/b>_view.<\/span>
\n<\/span>
\n<\/span>[quickstart.cloudera:21000] > Alter view <\/span>Employees<\/b>_view as select id, name, <\/span>
\n<\/span>salary from <\/span>Employees<\/b>;<\/span><\/p>\n
Impala does the specified changes to the <\/span>Employees<\/b>_view on executing the above query.
\n<\/span>Query: alter view <\/span>Employees<\/b>_view as select id, name, salary from <\/span>Employees<\/b><\/p>\n
Verification<\/span><\/h2>\n
So, here we are verifying the contents of the view named <\/span>Employees<\/b>_view, using the Impala Alter view statement,<\/span>
\n<\/span>
\n<\/span>[quickstart.cloudera:21000] > select * from <\/span>Employees<\/b>_view;<\/span>
\n<\/span>Query: select * from <\/span>Employees<\/b>_view<\/span>
\nResult is:<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
id<\/b><\/td>\nname<\/b><\/td>\nsalary<\/b><\/td>\n<\/tr>\n
3<\/b><\/td>\nkajal<\/b><\/td>\n40000<\/b><\/td>\n<\/tr>\n
2<\/b><\/td>\nmonika<\/b><\/td>\n15000<\/b><\/td>\n<\/tr>\n
5<\/b><\/td>\nshreyash<\/b><\/td>\n30000<\/b><\/td>\n<\/tr>\n
6<\/b><\/td>\nmehul<\/b><\/td>\n32000<\/b><\/td>\n<\/tr>\n
1<\/b><\/td>\nshubham<\/b><\/td>\n20000<\/b><\/td>\n<\/tr>\n
4<\/b><\/td>\nrevti<\/b><\/td>\n35000<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Fetched 6 row(s) in 0.69s<\/span><\/p>\n
Altering a View using Hue<\/span><\/h2>\n
Here are the following steps, we can follow for Altering a View using Hue:<\/span><\/p>\n
    \n
  1. At first, type the Alter View statement in Impala Query editor. Further, select the context as my_db, then click on the execute button.<\/span><\/li>\n
  2. \u00a0The view named sample will be altered accordingly, just after executing the query.<\/span><\/li>\n<\/ol>\n
    So, this was all about Impala Alter View Statements. Hope you like<\/p>\n
    Conclusion<\/span><\/h2>\n
    As a result, we have seen the whole concept of Impala Alter View Statement. Still, if any doubt occurs in how to alter the data in the view, feel free to ask in the comment section.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
    In our last Impala Tutorial, we saw Create & Drop View Statements. Here, we are going to discuss Impala Alter View Statement. It helps to change the query associated with a view in Impala....<\/p>\n","protected":false},"author":6,"featured_media":19117,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[16626,16628,6479,16627],"class_list":["post-12985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-impala","tag-alter-view-statement-in-impala","tag-altering-a-view-using-hue","tag-impala-alter-view-statement","tag-what-is-impala-alterview-statement"],"yoast_head":"\nImpala ALTER VIEW Statement - How to Alter a View - DataFlair<\/title>\n<meta name=\"description\" content=\"Impala ALTER VIEW Statement- Syntax of Impala Alter View, Verification & Example of Alter view statements in Impala, how to alter a view using Hue\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/impala-alter-view-statement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Impala ALTER VIEW Statement - 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