【六】hive DDL之Show
Show Databases
SHOW (DATABASES|SCHEMAS) [LIKE 'identifier_with_wildcards'];Show Tables/Views/Partitions/Indexes
Show Tables
SHOW TABLES [IN database_name] ['identifier_with_wildcards'];Show Views
SHOW VIEWS [IN/FROM database_name] [LIKE 'pattern_with_wildcards'];例子
SHOW VIEWS; -- show all views in the current database
SHOW VIEWS 'test_*'; -- show all views that start with "test_"
SHOW VIEWS '*view2'; -- show all views that end in "view2"
SHOW VIEWS LIKE 'test_view1|test_view2'; -- show views named either "test_view1" or "test_view2"
SHOW VIEWS FROM test1; -- show views from database test1
SHOW VIEWS IN test1; -- show views from database test1 (FROM and IN are same)
SHOW VIEWS IN test1 "test_*"; -- show views from database test2 that start with "test_"Show Partitions
显示该表有哪些分区
SHOW PARTITIONS table_name;也可以指定分区过滤条件
SHOW PARTITIONS table_name PARTITION(ds='2010-03-03'); -- (Note: Hive 0.6 and later)
SHOW PARTITIONS table_name PARTITION(hr='12'); -- (Note: Hive 0.6 and later)
SHOW PARTITIONS table_name PARTITION(ds='2010-03-03', hr='12'); -- (Note: Hive 0.6 and later)Show Table/Partition Extended
Show Table Extended会显示所有符合匹配的表信息。
SHOW TABLE EXTENDED [IN|FROM database_name] LIKE 'identifier_with_wildcards' [PARTITION(partition_spec)];
例子
hive> show table extended like part_table;
OK
tableName:part_table
owner:thejas
location:file:/tmp/warehouse/part_table
inputformat:org.apache.hadoop.mapred.TextInputFormat
outputformat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
columns:struct columns { i32 i}
partitioned:true
partitionColumns:struct partition_columns { string d}
totalNumberFiles:1
totalFileSize:2
maxFileSize:2
minFileSize:2
lastAccessTime:0
lastUpdateTime:1459382233000Show Table Properties
SHOW TBLPROPERTIES tblname;
SHOW TBLPROPERTIES tblname("foo");Show Create Table
SHOW CREATE TABLE ([db_name.]table_name|view_name);Show Indexes
SHOW [FORMATTED] (INDEX|INDEXES) ON table_with_index [(FROM|IN) db_name];Show Columns
SHOW COLUMNS (FROM|IN) table_name [(FROM|IN) db_name];例子
-- SHOW COLUMNS
CREATE DATABASE test_db;
USE test_db;
CREATE TABLE foo(col1 INT, col2 INT, col3 INT, cola INT, colb INT, colc INT, a INT, b INT, c INT);
-- SHOW COLUMNS basic syntax
SHOW COLUMNS FROM foo; -- show all column in foo
SHOW COLUMNS FROM foo "*"; -- show all column in foo
SHOW COLUMNS IN foo "col*"; -- show columns in foo starting with "col" OUTPUT col1,col2,col3,cola,colb,colc
SHOW COLUMNS FROM foo '*c'; -- show columns in foo ending with "c" OUTPUT c,colc
SHOW COLUMNS FROM foo LIKE "col1|cola"; -- show columns in foo either col1 or cola OUTPUT col1,cola
SHOW COLUMNS FROM foo FROM test_db LIKE 'col*'; -- show columns in foo starting with "col" OUTPUT col1,col2,col3,cola,colb,colc
SHOW COLUMNS IN foo IN test_db LIKE 'col*'; -- show columns in foo starting with "col" (FROM/IN same) OUTPUT col1,col2,col3,cola,colb,colc
-- Non existing column pattern resulting in no match
SHOW COLUMNS IN foo "nomatch*";
SHOW COLUMNS IN foo "col+"; -- + wildcard not supported
SHOW COLUMNS IN foo "nomatch";Show Functions
SHOW FUNCTIONS "a.*";Show Granted Roles and Privileges
Show Locks
SHOW LOCKS ;
SHOW LOCKS EXTENDED;
SHOW LOCKS PARTITION ();
SHOW LOCKS PARTITION () EXTENDED;
SHOW LOCKS (DATABASE|SCHEMA) database_name; -- (Note: Hive 0.13.0 and later; SCHEMA added in Hive 0.14.0) Show Conf
SHOW CONF ; Show Transactions
SHOW TRANSACTIONS;Show Compactions
SHOW COMPACTIONS;