Most of the keywords are reserved through HIVE in order to reduce the ambiguity in grammar version 1. There are two ways if the user still would like to use those reserved keywords as identifiers: 1 use quoted identifiers, 2 set hive. It only changes the default parent-directory where new tables will be added for this database.
This behaviour is analogous to how changing a table-directory does not move existing partitions to a different location. To revert to the default database, use the keyword " default " instead of a database name. An error is thrown if a table or view with the same name already exists. See Alter Table below for more information about table comments, table properties, and SerDe properties.
By default Hive creates managed tables, where files, metadata and statistics are managed by internal Hive processes. For details on the differences between managed and external table see Managed vs. External Tables. Hive supports built-in and custom-developed file formats.
See CompressedStorage for details on compressed table storage. The following are some of the formats built-in to Hive:. You can create tables with a custom SerDe or using a native SerDe.
For more information on SerDes see:. You must specify a list of columns for tables that use a native SerDe. Refer to the Types part of the User Guide for the allowable column types. A list of columns for tables that use a custom SerDe may be specified but Hive will query the SerDe to determine the actual list of columns for this table. To use the SerDe, specify the fully qualified class name org. A table can have one or more partition columns and a separate data directory is created for each distinct value combination in the partition columns.
This can improve performance on certain kinds of queries. If, when creating a partitioned table, you get this error: "FAILED: Error in semantic analysis: Column repeated in partitioning columns," it means you are trying to include the partitioned column in the data of the table itself. You probably really do have the column defined.How to Create Table in Hive
However, the partition you create makes a pseudocolumn on which you can query, so you must rename your table column to something else that users should not query on!
Now you want to partition on date. Your Hive definition could use "dtDontQuery" as a column name so that "date" can be used for partitioning and querying.
The table is also partitioned and data is stored in sequence files. The data format in the files is assumed to be field-delimited by ctrl-A and row-delimited by newline.
Specify a value for the key hive. This comes in handy if you already have data generated. Starting Hive 4. For another example of creating an external table, see Loading Data in the Tutorial. Tables can also be created and populated by the results of a query in one create-table-as-select CTAS statement.
The table created by CTAS is atomic, meaning that the table is not seen by other users until all the query results are populated. So other users will either see the table with the complete results of the query or will not see the table at all.
Starting with Hive 3.Apache Hive is a Data warehouse system which is built to work on Hadoop. Before becoming an open source project of Apache Hadoop, Hive was originated in Facebook. Hive is used because the tables in Hive are similar to tables in a relational database. Many users can simultaneously query the data using Hive-QL.
Hive stores the schema of the Hive tables in a Hive Metastore. By default, the metastore is run in the same process as the Hive service and the default Metastore is DerBy Database. Serializer, Deserializer gives instructions to hive on how to process a record. DDL statements are used to build and modify the tables and other objects in the database. The database creates in a default location of the Hive warehouse. When we create a table in hive, it creates in the default location of the hive warehouse.
Note : retail. DML statements are used to retrieve, store, modify, delete, insert and update data in the database. If the keyword local is not specified we have to use the HDFS path of the file. The create external keyword is used to create a table and provides a location where the table will create, so that Hive does not use a default location for this table. The insert command is used to load the data Hive table. Inserts can be done to a table or a partition.
So we need to set the following parameters in Hive shell. Here there are 3 different categories. Suppose there is another table cate where f1 is field name of category. Hive is just a part of the big puzzle called Big Data and Hadoop. Hadoop is much more than just Hive. Click below to see what other skills you should master in Hadoop. Got a question for us? Please mention it in the comments section and we will get back to you. Hive Data Models. Already have an account? Sign in. What is Big Data?
Introduction to Hadoop. What is Hadoop? Hadoop Distributed File System. Hadoop Installation. Data Loading Tools. Apache Pig. Apache Hive.
Apache HBase. Apache Oozie. Hadoop Interview Questions.Keeping you updated with latest technology trends, Join DataFlair on Telegram. Also, we will cover its syntax, usage as well as an example to understand it well. In addition, it is a flexible way to do it.
Hive - Create Table
In other words, we can say to get the list of all the existing tables in the current database we use the show tables statement in Impala. Follow this link to know about Impala Select Statement.
Also, the preceding LIKE keyword is optional. Although, make sure use all lowercase letters in the pattern string because all object names are stored in lowercase. For example:. It is not possible to cancel it. That implies it Cannot be canceled. Let us understand it with an example of the show tables statement. So, begin with changing the context to the required database if we want to get the list of tables in a particular database. Then using show tables statement we will get the list of tables in it.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Assuming you have "table" already in Hive, is there a quick way like other databases to be able to get the "CREATE" statement for that table? As of Hive 0. Steps to generate Create table ddls for all the tables in the Hive database and export into text file to run later:.
Learn more. Ask Question. Asked 6 years, 8 months ago. Active 1 year, 4 months ago. Viewed k times. Rolando Rolando 35k 73 73 gold badges silver badges bronze badges. Active Oldest Votes. Lukas Vermeer Lukas Vermeer 5, 2 2 gold badges 12 12 silver badges 19 19 bronze badges. Steps to generate Create table ddls for all the tables in the Hive database and export into text file to run later: step 1 create a.
Aditya Aditya 1, 12 12 silver badges 23 23 bronze badges. You should also append a semicolon after each statement so that the script can be executed by saying hive -f HiveTableDDL.
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Impala SHOW Statement – Listing the Tables using Hue
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