LOAD DATA
Description
LOAD DATA statement loads the data into a Hive serde table from the user specified directory or file. If a directory is specified then all the files from the directory are loaded. If a file is specified then only the single file is loaded. Additionally the LOAD DATA statement takes an optional partition specification. When a partition is specified, the data files (when input source is a directory) or the single file (when input source is a file) are loaded into the partition of the target table.
Syntax
LOAD DATA [ LOCAL ] INPATH path [ OVERWRITE ] INTO TABLE table_identifier [ partition_spec ]
Parameters
-
path
Path of the file system. It can be either an absolute or a relative path.
-
table_identifier
Specifies a table name, which may be optionally qualified with a database name.
Syntax:
[ database_name. ] table_name -
partition_spec
An optional parameter that specifies a comma separated list of key and value pairs for partitions.
Syntax:
PARTITION ( partition_col_name = partition_col_val [ , ... ] ) -
LOCAL
If specified, it causes the
INPATHto be resolved against the local file system, instead of the default file system, which is typically a distributed storage. -
OVERWRITE
By default, new data is appended to the table. If
OVERWRITEis used, the table is instead overwritten with new data.
Examples
-- Example without partition specification.
-- Assuming the students table has already been created and populated.
SELECT * FROM students;
+---------+----------------------+----------+
| name| address|student_id|
+---------+----------------------+----------+
|Amy Smith|123 Park Ave, San Jose| 111111|
+---------+----------------------+----------+
CREATE TABLE test_load (name VARCHAR(64), address VARCHAR(64), student_id INT) USING HIVE;
-- Assuming the students table is in '/user/hive/warehouse/'
LOAD DATA LOCAL INPATH '/user/hive/warehouse/students' OVERWRITE INTO TABLE test_load;
SELECT * FROM test_load;
+---------+----------------------+----------+
| name| address|student_id|
+---------+----------------------+----------+
|Amy Smith|123 Park Ave, San Jose| 111111|
+---------+----------------------+----------+
-- Example with partition specification.
CREATE TABLE test_partition (c1 INT, c2 INT, c3 INT) PARTITIONED BY (c2, c3);
INSERT INTO test_partition PARTITION (c2 = 2, c3 = 3) VALUES (1);
INSERT INTO test_partition PARTITION (c2 = 5, c3 = 6) VALUES (4);
INSERT INTO test_partition PARTITION (c2 = 8, c3 = 9) VALUES (7);
SELECT * FROM test_partition;
+---+---+---+
| c1| c2| c3|
+---+---+---+
| 1| 2| 3|
| 4| 5| 6|
| 7| 8| 9|
+---+---+---+
CREATE TABLE test_load_partition (c1 INT, c2 INT, c3 INT) USING HIVE PARTITIONED BY (c2, c3);
-- Assuming the test_partition table is in '/user/hive/warehouse/'
LOAD DATA LOCAL INPATH '/user/hive/warehouse/test_partition/c2=2/c3=3'
OVERWRITE INTO TABLE test_load_partition PARTITION (c2=2, c3=3);
SELECT * FROM test_load_partition;
+---+---+---+
| c1| c2| c3|
+---+---+---+
| 1| 2| 3|
+---+---+---+