Creates a new table.
Syntax
| Code Block | ||||
|---|---|---|---|---|
| ||||
CREATE TABLE [schema_name.]table_name
(
column_name <data_type> [PRIMARY KEY] [,...]
)
[PARTITION BY RANGE(column_name) EVERY (<part_interval>)]
<Data_type> ::=
{
INT | BIGINT | FLOAT | DOUBLE | STRING | TIMESTAMP
}
<part_interval> ::=
{
n |
VALUE |
INTERVAL 'n' {month | day | hour}
}
CREATE TABLE [schema_name.]table_name MERGE FROM [schema_name.]source-table1, [schema_name.]source-table2[,...] |
Description
Create a new table object. Create table statement supports creation of a new empty table or merge of existing source tables into a new table.
Table name and column names must be a valid identifier. For more details on Jethro data types attributes, see Data Types. A table can have one primary key column. Primary keys must contain unique values and cannot contain NULL values.
...
Clauses Details
| Clause | Mandatory? | Details | ||||||
|---|---|---|---|---|---|---|---|---|
| PARTITION BY |
| The clause defines range partitioning. Unlike Hive and Impala, in Jethro the partition column name must be one of the columns previously defined in the table column list. Partitioning interval specification depends on the data type of the partitioning column:
*The valid range for 'n' is: 0<n<(2^32-1), integer values only. |
Merged Table
...
| MERGE FROM |
| The clause declare vertical merge of two or more tables |
...
. The newly created merged target table table will hold |
...
the columns from all it's source tables. |
...
Target table column names are generated from source tables columns Table merge constraints:
Important note: during table merge process source tables are eliminated. Example: CREATE TABLE NEW_TABLE MERGE FROM T1, T2; |