81 lines
3.5 KiB
SQL
81 lines
3.5 KiB
SQL
-- Syntax RENAME
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-- ALTER TABLE table_identifier RENAME TO table_identifier
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ALTER TABLE Student RENAME TO StudentInfo;
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-- ALTER TABLE table_identifier partition_spec RENAME TO partition_spec
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ALTER TABLE default.StudentInfo PARTITION (age='10') RENAME TO PARTITION (age='15');
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ALTER TABLE default.StudentInfo PARTITION (age=10) RENAME TO PARTITION (age=12.323);
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-- Syntax ADD COLUMNS
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-- ALTER TABLE table_identifier ADD COLUMNS ( col_spec [ , ... ] )
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ALTER TABLE StudentInfo ADD COLUMNS (LastName string, DOB timestamp);
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-- Syntax DROP COLUMNS
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-- ALTER TABLE table_identifier DROP { COLUMN | COLUMNS } [ ( ] col_name [ , ... ] [ ) ]
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ALTER TABLE StudentInfo DROP columns (LastName, DOB);
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-- Syntax RENAME COLUMN
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-- ALTER TABLE table_identifier RENAME COLUMN col_name TO col_name
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ALTER TABLE StudentInfo RENAME COLUMN name TO FirstName;
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-- Syntax ALTER OR CHANGE COLUMN
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-- ALTER TABLE table_identifier { ALTER | CHANGE } [ COLUMN ] col_name alterColumnAction
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ALTER TABLE StudentInfo ALTER COLUMN FirstName COMMENT "new comment";
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ALTER TABLE StudentInfo CHANGE COLUMN FirstName COMMENT "new comment";
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ALTER TABLE StudentInfo ALTER FirstName COMMENT "new comment";
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ALTER TABLE StudentInfo CHANGE FirstName COMMENT "new comment";
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-- Syntax REPLACE COLUMNS
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-- ALTER TABLE table_identifier [ partition_spec ] REPLACE COLUMNS [ ( ] qualified_col_type_with_position_list [ ) ]
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ALTER TABLE StudentInfo REPLACE COLUMNS (name string, ID int COMMENT 'new comment');
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ALTER TABLE StudentInfo REPLACE COLUMNS name string, ID int COMMENT 'new comment';
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-- Syntax ADD PARTITION
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-- ALTER TABLE table_identifier ADD [IF NOT EXISTS] ( partition_spec [ partition_spec ... ] )
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ALTER TABLE StudentInfo ADD IF NOT EXISTS PARTITION (age=18);
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ALTER TABLE StudentInfo ADD PARTITION (age=18);
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-- Adding multiple partitions to the table
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ALTER TABLE StudentInfo ADD IF NOT EXISTS PARTITION (age=18) PARTITION (age=20);
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ALTER TABLE StudentInfo ADD PARTITION (age=18) PARTITION (age=20);
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-- Syntax DROP PARTITION
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-- ALTER TABLE table_identifier DROP [ IF EXISTS ] partition_spec [PURGE]
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ALTER TABLE StudentInfo DROP IF EXISTS PARTITION (age=18);
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ALTER TABLE StudentInfo DROP PARTITION (age=18);
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-- Syntax SET TABLE PROPERTIES
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-- ALTER TABLE table_identifier SET TBLPROPERTIES ( key1 = val1, key2 = val2, ... )
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ALTER TABLE dbx.tab1 SET TBLPROPERTIES ('comment' = 'A table comment.');
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-- Unset Table Properties
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-- ALTER TABLE table_identifier UNSET TBLPROPERTIES [ IF EXISTS ] ( key1, key2, ... )
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ALTER TABLE dbx.tab1 UNSET TBLPROPERTIES IF EXISTS ('winner');
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ALTER TABLE dbx.tab1 UNSET TBLPROPERTIES ('winner');
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-- Syntax SET SERDE
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-- ALTER TABLE table_identifier [ partition_spec ] SET SERDEPROPERTIES ( key1 = val1, key2 = val2, ... )
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ALTER TABLE test_tab SET SERDE 'org.apache.hadoop.hive.serde2.columnar.LazyBinaryColumnarSerDe';
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-- ALTER TABLE table_identifier [ partition_spec ] SET SERDE serde_class_name [ WITH SERDEPROPERTIES ( key1 = val1, key2 = val2, ... ) ]
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ALTER TABLE dbx.tab1 SET SERDE 'org.apache.hadoop' WITH SERDEPROPERTIES ('k' = 'v', 'kay' = 'vee')
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-- Syntax SET LOCATION And SET FILE FORMAT
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-- ALTER TABLE table_identifier [ partition_spec ] SET FILEFORMAT file_format
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ALTER TABLE loc_orc SET FILEFORMAT orc;
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ALTER TABLE p1 partition (month=2, day=2) SET FILEFORMAT parquet;
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-- ALTER TABLE table_identifier [ partition_spec ] SET LOCATION 'new_location'
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ALTER TABLE dbx.tab1 PARTITION (a='1', b='2') SET LOCATION '/path/to/part/ways'
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ALTER TABLE dbx.tab1 SET LOCATION '/path/to/part/ways'
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-- Syntax RECOVER PARTITIONS
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-- ALTER TABLE table_identifier RECOVER PARTITIONS
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ALTER TABLE dbx.tab1 RECOVER PARTITIONS;
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