![]() Tables can be seen in the Database Explorer. For more information about the view, see View data. When you double-click a table in the Database Explorer ( View | Tool Windows | Database Explorer), the table is opened in the editor in the Table view. With DataGrip, you can perform data manipulation and data definition operations with tables. The table has a specified number of columns, but can have any number of rows. Data in a table is stored in a cell that is an intersection of a vertical column and horizontal row. A database table is a structure that organises data into rows and columns. tab1 SET TBLPROPERTIES ( 'winner' = 'loser' ) -DROP TABLE PROPERTIES ALTER TABLE dbx. tab1 SET SERDE '' WITH SERDEPROPERTIES ( 'k' = 'v', 'kay' = 'vee' ) -SET TABLE PROPERTIES ALTER TABLE dbx. tab1 PARTITION ( a = '1', b = '2' ) SET LOCATION '/path/to/part/ways' - SET SERDE/ SERDE Properties ALTER TABLE test_tab SET SERDE '.圜olumnarSerDe' ALTER TABLE dbx. StudentInfo PARTITION ( age = '10' ) RENAME TO PARTITION ( age = '15' ) -After renaming Partition SHOW PARTITIONS StudentInfo + -+-+ | partition | + -+-+ | age = 11 | | age = 12 | | age = 15 | + -+-+ - Add new column to a table DESC StudentInfo + -+-+-+-+ | col_name | data_type | comment | + -+-+-+-+ | name | string | NULL | | rollno | int | NULL | | age | int | NULL | | # Partition Information | | | | # col_name | data_type | comment | | age | int | NULL | + -+-+-+ ALTER TABLE StudentInfo ADD columns ( LastName string, DOB timestamp ) -After Adding New columns to the table DESC StudentInfo + -+-+-+-+ | col_name | data_type | comment | + -+-+-+-+ | name | string | NULL | | rollno | int | NULL | | LastName | string | NULL | | DOB | timestamp | NULL | | age | int | NULL | | # Partition Information | | | | # col_name | data_type | comment | | age | int | NULL | + -+-+-+-+ -Change the fileformat ALTER TABLE loc_orc SET fileformat orc ALTER TABLE p1 partition ( month = 2, day = 2 ) SET fileformat parquet -Change the file Location ALTER TABLE dbx. Examples -RENAME table DESC student + -+-+-+-+ | col_name | data_type | comment | + -+-+-+-+ | name | string | NULL | | rollno | int | NULL | | age | int | NULL | | # Partition Information | | | | # col_name | data_type | comment | | age | int | NULL | + -+-+-+-+ ALTER TABLE Student RENAME TO StudentInfo -After Renaming the table DESC StudentInfo + -+-+-+-+ | col_name | data_type | comment | + -+-+-+-+ | name | string | NULL | | rollno | int | NULL | | age | int | NULL | | # Partition Information | | | | # col_name | data_type | comment | | age | int | NULL | + -+-+-+-+ -RENAME partition SHOW PARTITIONS StudentInfo + -+-+ | partition | + -+-+ | age = 10 | | age = 11 | | age = 12 | + -+-+ ALTER TABLE default. ) Specifies the SERDE properties to be set. PARTITION (part_spec) Specifies the partition on which the property has to be set. ![]() ![]() Syntax -Changing File Format ALTER TABLE table_name SET FILEFORMAT file_format -Changing File Location ALTER TABLE table_name SET LOCATION 'new_location' Parameters table_name The name of an existing table. ) ALTER TABLE table_name SET SERDE serde_class_name SET LOCATION And SET FILE FORMATĪLTER TABLE SET command can also be used for changing the file location and file format forĮxsisting tables. ![]() Syntax -Set SERDE Propeties ALTER TABLE table_name SET SERDEPROPERTIES ( key1 = val1, key2 = val2. This overrides the old value with the new one. If a particular property was already set, ) SET SERDEĪLTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. ) -Unset Table Properties ALTER TABLE table_name UNSET TBLPROPERTIES ( key1, key2. Syntax -Set Table Properties ALTER TABLE table_name SET TBLPROPERTIES ( key1 = val1, key2 = val2. This overrides the old value with the new one.ĪLTER TABLE UNSET is used to drop the table property. SET AND UNSET SET TABLE PROPERTIESĪLTER TABLE SET command is used for setting the table properties. COLUMNS (col_spec) Specifies the columns to be added to be renamed. Syntax ALTER TABLE table_name ADD COLUMNS ( col_spec ) Parameters table_name The name of an existing table. ADD COLUMNSĪLTER TABLE ADD COLUMNS statement adds mentioned columns to an existing table. new_table_name New name using which the table has to be renamed. ![]() Syntax ALTER TABLE old_table_name RENAME TO new_table_name ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition_spec Parameters old_table_name Name of an existing table. RENAMEĪLTER TABLE RENAME statement changes the table name of an existing table in the database. ALTER TABLE statement changes the schema or properties of a table. ![]()
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