Is there a way in hive query to check if a table exists before selecting. HIVE-6754 Inconsistent default for hive.exec.drop.ignorenonexistent. The below syntax can be used to delete the database. (1 reply) Hi, I've had a look through the Wiki but couldn't see anything- is there a good (performant) way to check whether a partition exists for a table? DROP TABLE IF EXISTS throws exception if the table does not exist. Se provassimo a cancellare una tabella che non esiste e la variabile di configurazione di Hive hive.exec.drop.ignorenonexistent fosse impostata a false, verremmo respinti da un messaggio di errore. Impala "drop table" fails with Hive Metastore exception. When you delete a file/folder it is not removed permanently . Log In. DROP TABLE Syntax DROP TABLE [IF EXISTS] table_name [PURGE]; DATABSE and SCHEMA can be used interchangeably in Hive as both refer to the same. Appreciate any help. Creates a new external table in Hive. The following query is used to verify the list of tables. Drop Table Statement The DROP TABLE statement is used to drop an existing table in a database. This makes sure the data is not moved to TRASH instead it is permanently removed. If you need to drop all tables then the easiest way is to drop the database . hive> DROP DATABASE IF EXISTS userdb; If you are absolutely sure that the table needs to be permanently deleted then you can use PURGE. Rilascia partizione Drop partition ALTER TABLE table_name DROP [IF EXISTS] (PARTITION part_spec, ...) part_spec: : (part_col_name1=val1, part_col_name2=val2, ...) Eliminare una partizione da una tabella o da una vista. In Hive, it is not allowed to drop the database that contains the tables directly. If the tables is an internal/managed table then the data along with metadata is removed permanently. Spark Dataframe drop rows with NULL values, Hive/Spark – Find External Tables in hive from a List of tables. If the table already exists, delete it. I tried set hive.exec.drop.ignorenonexistent=true, and it made no difference. Thanks in advance. Export. The first thing that comes to mind if if we can show multiple tables using LIKE then can we DROP multiple tables as well. Use the following commands to compile and execute this program. Hive ALTER TABLE command is used to update or drop a partition from a Hive Metastore and HDFS location (managed table). When you delete a file/folder it is not removed permanently . The answer sadly is no. DROP TABLE [IF EXISTS] [db_name. DROP TABLE employee; As of now this is not possible in HIVE. Recover Partitions (MSCK REPAIR TABLE) Hive stores a list of partitions for each table in its metastore. Thanks in advance. Categories . It can be a normal table (stored in Metastore) or an external table (stored in local file system); Hive treats both in the same manner, irrespective of their types. 它可以是一个正常的表(存储在Metastore)或外部表(存储在本地文件系统); 不论什么类型Hive对待的方式相同。 Drop Table语句. This chapter describes how to drop a table in Hive. DROP DATABASE was added in Hive 0.6. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. DROP TABLE DROP TABLE: se la tabella esiste già, la elimina. 5G Network; Agile; Amazon EC2; Android; Angular; Ansible; Arduino Drop Table Statement. If you want to learn more you can always refer cwiki.apache.org page confluence page. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. People. If the table does exist, it is dropped; if it does not exist, the statement has no effect. This site uses Akismet to reduce spam. Hive> DROP DATABASE IF EXISTS std_db CASCADE; CASCADE will be used to delete all table… It can be a normal table (stored in Metastore) or an external table (stored in local file system); Hive treats both in the same manner, irrespective of their types. The files are created as 0000_n.bz2 and they are still on disk. The syntax of IF EXISTS is as follows: drop table if exists table_name hive – PURGE. In such a case, we can drop the database either by dropping tables first or use Cascade keyword with the command. Syntax: DROP TABLE [IF EXISTS] table_name [PURGE]; Example: DROP TABLE IF EXISTS hql.customer; Underlying data of this internal table will be moved to Trash folder. DROP TABLE Examples. DROP TABLE IF EXISTS hql.customer PURGE; Underlying data in HDFS will be purged directly and table cannot be restored. This operation is allowed only for tables created using the Hive format. Let us assume std_db is the database created by the user needs to dropped. For example, let's say I have a table that stores Ad Impressions and these are partitioned for various countries/regions and by date. std_details table can be dropped by using the below DROP TABLE command. In case if the PURGE option is mentioned the data will be completely lost and cannot be recovered later but if not mentioned then data will move to .Trash/current directory. If we want the statement to succeed even if the table is not present then we need to use “IF EXISTS”. The syntax to drop external table is as follow: If you want to learn more about the difference between Hive Internal/Managed and External Tables then you can click here. When you drop a Hive table all the metadata information related to the table is dropped. Its syntax is as follows: DROP DATABASE StatementDROP (DATABASE|SCHEMA) [IF EXISTS] database_name [RESTRICT|CASCADE]; The following queries are used to drop a database. 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