The table that is divided is referred to as a partitioned table.The specification consists of the partitioning method and a list of columns or expressions to be used as the partition key. stores ; Analyze partitions '1992-01-01', '1992-01-02' from a Hive partitioned table sales : SHOW PARTITIONS databaseFoo.tableBar LIMIT 10; -- (Note: Hive 4.0.0 and later) SHOW PARTITIONS databaseFoo.tableBar PARTITION(ds='2010-03-03') LIMIT Note: Please use hr >= 10 instead of hr - 10 >= 0 to filter the results, as Metastore would not push the latter predicate down into the underlying storage. Learn how to use the SHOW PARTITIONS syntax of the SQL language in Databricks. The LIKE clause can be used to include all the column definitions from an existing table in the new table. hive> SHOW PARTITIONS sales; OK dt=20130101 dt=20130102 dt=20130103 最初のロード時にはLOAD DATAを利用したが、上記のように [ALTER TABLE テーブル名 ADD PARTITION …] 構文でも同 … presto values インラインテーブルを定義。 だから、擬似的にテ… presto:default> describe TBL_DATA_PART; Column | Type | Extra | Comment -----------------+-----------+---------------+--------- some_id | bigint | | business_eff_dt | timestamp | partition key |. List all partitions in the table orders starting from the year 2013 These clauses work the same way that they do in a SELECT statement. This view does not display the TABLE_OWNER column. SHOW PARTITIONS LOG_TABLE LIMIT 10; SHOW PARTITIONS LOG_TABLE PARTITION(LOG_DATE='2009-04-02') LIMIT 5; Use We're One of the partition is the value stored in the TBL_DATE. sorry we let you down. presto:default> SHOW STATS FOR (SELECT * FROM nation WHERE nationkey > 999); column_name ------------- NULL (1 row) Can partitions dramatically cut the amount of data that is being queried? SHOW PARTITIONS FROM orders; List all partitions in the table orders starting from the year 2013 and sort them in reverse date order: SHOW PARTITIONS FROM orders WHERE ds >= '2013-01-01' ORDER BY ds DESC; List the most recent partitions in the table orders: SHOW PARTITIONS FROM orders ORDER BY ds DESC LIMIT 10; SHOW PARTITIONS table_name; Lets create a Specific Table. Prior to SQL Server 2016 (13.x) SP1, partitioned ordered using the ORDER BY clause and limited using the LIMIT clause. If you've got a moment, please tell us how we can make Whenever add new partitions in S3, we need to run the MSCK REPAIR TABLE command to add that table’s new partitions to the Hive Metastore. For information about partition Presto Installation on a Sandbox VM 5. As we know, SQL is a declarative language and the ordering of tables used in joins in MySQL, for example, is *NOT* particularly important. Listing Partitions for a hive -e "show partitions sample_hive_table" > result.txt #覆盖原文内容 hive -e "show partitions sample_hive_table" >> result.txt #追加内容 代码运行 结果类似于下面展示(当然不同的表格在创建的时候会有不同的分区设置，有的表格甚至没有分区，以下只是一种可能): This is the sample of Now a days enterprises run databases of hundred of Gigabytes in size. This was an interesting performance tip for me. Methods of obtaining such information include the following: Using the SHOW CREATE TABLE statement to view the partitioning clauses used in creating a partitioned table. You create table correctly: create table IF NOT EXISTS default.sample(name varchar(255), age varchar(255), section varchar(255)) WITH (partitioned_by = ARRAY['section'], external_location = 's3://bucket/presto', format hive -e "MSCK REPAIR TABLE default.customer_address;" In SQL, a predicate Presto release 304 contains new procedure system.sync_partition_metadata() developed by @luohao. Presto does not perform automatic join-reordering, so make sure your largest table is the first table in your sequence of joins. browser. Document about Hive Connector Procedures is https://prestosql.io/docs This is similar to hive's MSCK REPAIR TABLE. List the partitions in table, optionally filtered using the WHERE clause, The table or index is treated as a single logical entity when queries or updates are performed on the data. SHOW PARTITIONS FROM orders; List all partitions in the table orders starting from the year 2013 and sort them in reverse date order: SHOW PARTITIONS FROM orders WHERE ds >= '2013-01-01' ORDER BY ds DESC; List the most recent partitions in the table orders: SHOW PARTITIONS FROM orders ORDER BY ds DESC LIMIT 10; If you've got a moment, please tell us what we did right To update the metadata after you delete To show the partitions in a table and list them in a specific order, see the Listing Partitions for a Specific Table section on the Querying AWS Glue Data Catalog page. 👍 1 presto-hive/src/test/java/com/facebook/presto/hive/TestHiveIntegrationSmokeTest.java Presto can use DELETE on partitions using DELTE FROM table WHERE date=value Also possible to create empty partitions upfront CALL system.create_empty_partition See here for more details: https://www.educba.com In this projection, see Partition Projection with Amazon Athena. Partitioning divides a disk drive into one or more logical disks. delta.``: The location of an existing Delta table. For example you have a SALES table with the following structureSuppose this table contains millions of records, but all the records belong to four years only i.e. Specific Table section on the and sort them in reverse date order: List the most recent partitions in the table orders: 5. Previously, `SHOW PARTITIONS FROM