In a data warehouse environment, you will be working with heterogeneous data set. You may have to filter out unwanted data before loading it to the actual data into Hive table. For example, you many have a field1 of type string contains alphanumeric values. In many scenarios, you may get requirement to filter out non-numeric values. In this article, we will check Hadoop Hive isnumeric Alternative with some examples. Hadoop Hive isnumeric Function Many relational databases provide an extended SQL functions to help the data warehouse developers. Databases such as…

A JSON file is a file that stores simple data structures and objects in JavaScript Object Notation (JSON) format, which is a standard data interchange format. Json files are mainly used to transfer data in web applications. Many web applications use the json files for data transfer between application and servers. In this article, we will check how to extract or get value from json file using Hive queries. Extract Value from JSON using Hive Apache Hive provides limited support to JSON files. You can store json data into Hive…

Apache Hive like many other relational databases does not support dual table. You can simply use the SELECT without FROM clause to display the results of the function or expression that you are testing. But, it may cause a problem when you are migrating from Oracle to Hive. You may find a lot of queries using dual tables. In this article, we will check what is the dual table alternative in Hive and how to use it. What is DUAL table in Relational Databases? In relation databases, the DUAL is…

The best part of Apache Hive is it supports array types. i.e. you can store the array values in Hive table columns. With the help of an array, you can minimize the table rows by grouping together in the form of an array. In this article, we will check what is the Hive lateral view and how to use it with array values. You can use lateral view either with EXPLODE or INLINE function. What is Hive Lateral View? Before going in detail, let us check what is lateral view? In Hive, lateral view…

The Hive INSERT command is used to insert data into Hive table already created using CREATE TABLE command. Inserting data into partition table is a bit different compared to normal insert or relation database insert command. There are many ways that you can use to insert data into a partitioned table in Hive. In this article, we will check Hive insert into Partition table and some examples. Hive Insert into Partition Table As mentioned earlier, inserting data into a partitioned Hive table is quite different compared to relational databases. You…

Apache Hive has some very strict rules regarding data types for function parameters that you provide while executing it. Hive type conversion functions are used to explicitly convert to the required type and format. For example, Hive does not convert DOUBLE to FLOAT, INT to STRING etc. In my other post, we have discussed on Hive date functions and examples. In this article, we will check out Cloudera Hive type conversion functions with some examples. Related Article Commonly used Apache Hive Date Functions and Examples Apache Hive Type Conversion Functions…