{"id":12460,"date":"2018-04-10T05:02:58","date_gmt":"2018-04-10T05:02:58","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=12460"},"modified":"2021-05-09T13:11:02","modified_gmt":"2021-05-09T07:41:02","slug":"impala-offset-clause","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/impala-offset-clause\/","title":{"rendered":"Impala OFFSET Clause – 5 Min Tutorial"},"content":{"rendered":"

In our last tutorial, we discussed Limit Clause<\/strong> and Having Clause<\/strong>. Now, we will discuss Impala Offset Clause, used to\u00a0decide from where the output should be considered in\u00a0Impala<\/strong>. Moreover, we will learn introduction, syntax, and example of Impala Offset clause, to understand it well.<\/p>\n

So, let’s start Impala Offset Clause.<\/p>\n

Impala OFFSET Clause<\/span><\/h2>\n

Basically, in a SELECT query, this clause causes the result set to start some number of rows after the logical first item.<\/span> However, OFFSET 0 produces the same result as leaving out the OFFSET clause since the result set is numbered starting from zero.
\n\"\"<\/a>
\nAlso, make sure always use this clause in combination with ORDER BY. Hence it is clear which item should be first, second, and so on. Whereas LIMIT covers a bounded range, such as items 0-9, 100-199, and so on.<\/span>
\n<\/span>
\n<\/span>So, we can combine a LIMIT clause <\/strong>with an OFFSET clause to produce a small result set that is different from a top-N query, in Impala 1.2.1 and higher.<\/span><\/p>\n

Further, let\u2019s understand this with an example.\u00a0In order to return items 11 through 20 with simulate “paged” results, we will use this technique. <\/span><\/p>\n

Moreover, use this technique only for compatibility in cases where you cannot rewrite the application logic since Impala queries typically involve substantial amounts of I\/O.<\/span><\/p>\n

However, let’s define it in simple words.\u00a0Since we very well know the rows in the resultset of a select query starts from 0. So, to decide from where the output should be considered we use the offset clause.<\/p>\n

For example, \u00a0the result will be as usual if we choose the offset as 0. In the same way, the result starts from the fourth row if we choose the offset as 4.<\/p>\n

A Syntax of Offset Clause in Impala<\/span><\/h2>\n

So, the syntax for using Impala OFFSET Clause is-<\/span>
\n<\/span><\/p>\n

select data from table_name Group BY col_name;<\/pre>\n
Impala Offset Clause Example\u00a0<\/span><\/h2>\n
Lets take an example of Impala offset clause,<\/span>
\nBasically, to understand, let\u2019s suppose we have a table named <\/span>Employees<\/b> in the database my_db.<\/span> Further, its contents are \u2212
\n<\/span>
\n<\/span>[quickstart.cloudera:21000] > select * from Employees; <\/b>
\n<\/b>Query: select * from Employees <\/b><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
id<\/b><\/td>\nname<\/b><\/td>\nage<\/b><\/td>\naddress<\/b><\/td>\nsalary<\/b><\/td>\n<\/tr>\n
3<\/b><\/td>\nkajal<\/b><\/td>\n27<\/b><\/td>\nalirajpur<\/b><\/td>\n40000<\/b><\/td>\n<\/tr>\n
6<\/b><\/td>\nmehul<\/b><\/td>\n22<\/b><\/td>\nhyderabad<\/b><\/td>\n32000<\/b><\/td>\n<\/tr>\n
1<\/b><\/td>\nshubham<\/b><\/td>\n32<\/b><\/td>\ndelhi<\/b><\/td>\n20000<\/b><\/td>\n<\/tr>\n
5<\/b><\/td>\nshreyash<\/b><\/td>\n23<\/b><\/td>\npune<\/b><\/td>\n30000<\/b><\/td>\n<\/tr>\n
2<\/b><\/td>\nmonika<\/b><\/td>\n25<\/b><\/td>\nmumbai<\/b><\/td>\n15000<\/b><\/td>\n<\/tr>\n
8<\/b><\/td>\nRishabh<\/b><\/td>\n22<\/b><\/td>\nchennai<\/b><\/td>\n31000<\/b><\/td>\n<\/tr>\n
9<\/b><\/td>\nPulkit<\/b><\/td>\n23<\/b><\/td>\nGandhi nagar<\/b><\/td>\n28000<\/b><\/td>\n<\/tr>\n
7<\/b><\/td>\nVaishnavi<\/b><\/td>\n25<\/b><\/td>\nGoa<\/b><\/td>\n23000<\/b><\/td>\n<\/tr>\n
4<\/b><\/td>\nrevti<\/b><\/td>\n25<\/b><\/td>\nindore<\/b><\/td>\n35000<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Fetched 9 row(s) in 0.51s<\/b>
\nFurther, using limit and order by clauses, here we can arrange the records in the table in the ascending order of their id\u2019s and limit the number of records to 4.<\/span>
\n<\/span>
\n<\/span>Query: select * from Employees order by id limit 4 <\/b><\/b><\/p>\n\n\n\n\n\n\n\n
id<\/b><\/td>\nname<\/b><\/td>\nage<\/b><\/td>\naddress<\/b><\/td>\nsalary<\/b><\/td>\n<\/tr>\n
1<\/b><\/td>\nshubham<\/b><\/td>\n32<\/b><\/td>\ndelhi<\/b><\/td>\n20000<\/b><\/td>\n<\/tr>\n
2<\/b><\/td>\nmonika<\/b><\/td>\n25<\/b><\/td>\nmumbai<\/b><\/td>\n15000<\/b><\/td>\n<\/tr>\n
3<\/b><\/td>\nkajal<\/b><\/td>\n27<\/b><\/td>\nalirajpur<\/b><\/td>\n40000<\/b><\/td>\n<\/tr>\n
4<\/b><\/td>\nrevti<\/b><\/td>\n25<\/b><\/td>\nindore<\/b><\/td>\n35000<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Fetched 4 row(s) in 0.64s<\/b>
\nMoreover, here is an example of the offset clause.<\/span> Basically, we are getting the records in the Employees<\/b> table in the order of their id\u2019s and printing the first four rows starting from the 0th row.<\/span>
\n<\/span>
\n<\/span>[quickstart.cloudera:21000] > select * from Employees order by id limit 4 offset 0;<\/b>
\nSo, we get the following result, on executing, the above query.<\/span>
\n<\/span>
\n<\/span>Query: select * from Employees order by id limit 4 offset 0 <\/b><\/b><\/p>\n\n\n\n\n\n\n\n
id<\/b><\/td>\nname<\/b><\/td>\nage<\/b><\/td>\naddress<\/b><\/td>\nsalary<\/b><\/td>\n<\/tr>\n
1<\/b><\/td>\nshubham<\/b><\/td>\n32<\/b><\/td>\ndelhi<\/b><\/td>\n20000<\/b><\/td>\n<\/tr>\n
2<\/b><\/td>\nmonika<\/b><\/td>\n25<\/b><\/td>\nmumbai<\/b><\/td>\n15000<\/b><\/td>\n<\/tr>\n
3<\/b><\/td>\nkajal<\/b><\/td>\n27<\/b><\/td>\nalirajpur<\/b><\/td>\n40000<\/b><\/td>\n<\/tr>\n
4<\/b><\/td>\nrevti<\/b><\/td>\n25<\/b><\/td>\nindore<\/b><\/td>\n35000<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Fetched 4 row(s) in 0.62s<\/b>
\nAlso, we can get four records from the <\/span>Employees<\/b> table starting from the row having offset 5.<\/span>
\n<\/a><\/strong>
\n<\/span>[quickstart.cloudera:21000] > select * from Employees order by id limit 4 offset 5; <\/b>
\n<\/b>Query: select * from Employees order by id limit 4 offset 5 <\/b><\/b><\/p>\n\n\n\n\n\n\n
6<\/b><\/td>\nmehul<\/b><\/td>\n22<\/b><\/td>\nhyderabad<\/b><\/td>\n32000<\/b><\/td>\n<\/tr>\n
7<\/b><\/td>\nVaishnavi<\/b><\/td>\n25<\/b><\/td>\nGoa<\/b><\/td>\n23000<\/b><\/td>\n<\/tr>\n
8<\/b><\/td>\nRishabh<\/b><\/td>\n22<\/b><\/td>\nchennai<\/b><\/td>\n31000<\/b><\/td>\n<\/tr>\n
9<\/b><\/td>\nPulkit<\/b><\/td>\n23<\/b><\/td>\nGandhi nagar<\/b><\/td>\n28000<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n<\/b>Fetched 4 row(s) in 0.52s<\/b>
\nSo, this was all about Impala Offset Clause. Hope you like our explanation.<\/p>\n
Conclusion<\/span><\/h2>\n
As a result, we have seen the whole concept of Impala OFFSET Clause. Still, if any doubt occurs, feel free to ask in the comment section.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
In our last tutorial, we discussed Limit Clause and Having Clause. Now, we will discuss Impala Offset Clause, used to\u00a0decide from where the output should be considered in\u00a0Impala. Moreover, we will learn introduction, syntax,...<\/p>\n","protected":false},"author":6,"featured_media":19151,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[4243,6543,6544,6545,14039],"class_list":["post-12460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-impala","tag-example-impala-offset-clause","tag-impala-offset-clause","tag-impala-offset-clause-example","tag-impala-offset-clause-syntax","tag-syntax-impala-offset-clause"],"yoast_head":"\nImpala OFFSET Clause - 5 Min Tutorial - DataFlair<\/title>\n<meta name=\"description\" content=\"Impala OFFSET Clause- what is Offset clause in impala, syntax of Impala Offset clause, offset clause in impala example,real time example of impala Offset\" \/>\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-offset-clause\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Impala OFFSET Clause - 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