2/12/2024 0 Comments Rename tabular database> ALTER TABLE StudentInfo DROP IF EXISTS PARTITION (age=18) After adding a new partition to the table > ALTER TABLE StudentInfo ADD IF NOT EXISTS PARTITION (age=18) > ALTER TABLE StudentInfo ADD columns (LastName string, DOB timestamp) > ALTER TABLE default.StudentInfo PARTITION (age='10') RENAME TO PARTITION (age='15') > ALTER TABLE Student RENAME TO StudentInfo You need to have apply_tag permission to remove tags from the table.įor Delta Lake add constraints and alter column examples, see The tag_name must be unique within the table or column. You need to have apply_tag permission to add tags to the table.Ī literal STRING. SET TAGS ( )Īpplies to: Databricks SQL Databricks Runtime 13.3 LTS and aboveĪpply tags to the table. Transfers ownership of the table to principal.Īpplies to: Databricks SQL SQL warehouse version 2022.35 or higher Databricks Runtime 11.2 and above Specifies the new location for the table.įiles in the original location will not be moved to the new location. Removes one or more user defined properties. Sets or resets one or more user defined properties. Instructs Azure Databricks to scan the table’s location and add any files to the table which have been added directly to the filesystem.Īpplies to: Databricks SQL Databricks Runtime 12.2 and above Unity Catalogĭrops the row filter from the table, if any.įuture queries will return all rows from the table without any automatic filtering. Truncating the table history limits your ability to perform DESCRIBE HISTORY and execute time travel queries.Īdds one or more partitions to the table.ĭrops one or more partitions from the table. Optionally allows you to initiate the second phase of dropping a reader-plus-writer feature after 24 hours by truncating the table history to when the invocation command was executed. If the feature is not present in the table Azure Databricks raises DELTA_FEATURE_DROP_FEATURE_NOT_PRESENT. The name of a feature in form of a STRING literal or identifier, that must be understood by Azure Databricks and be supported on the table. If you initiate the second invocation too early Azure Databricks raises DELTA_FEATURE_DROP_WAIT_FOR_RETENTION_PERIOD or DELTA_FEATURE_DROP_HISTORICAL_VERSIONS_EXIST. You then need to wait until the retention period is over and re-execute the statement to complete removal. The first invocation clears any traces of the feature and informs you of partial success. Removal of features which affect both readers and writers require a two stage process: Removes a feature from a Delta Lake table. Renames a column or field in a Delta Lake table.Īdds a check constraint, informational foreign key constraint, or informational primary key constraint to the table.įoreign keys and primary keys are supported only for tables in Unity Catalog, not the hive_metastore catalog.ĭrops a primary key, foreign key, or check constraint from the table.ĭROP FEATURE feature_name Īpplies to: Databricks SQL Databricks Runtime 14.1 and above The name must not include a temporal specification.Ĭhanges a property or the location of a column.ĭrop one or more columns or fields in a Delta Lake table. Renames the table within the same schema. If the table cannot be found Azure Databricks raises a TABLE_OR_VIEW_NOT_FOUND error. The name must not include a temporal specification. If you use Unity Catalog you must have MODIFY permission to:Īll other operations require ownership of the table. On foreign tables, you can perform only ALTER TABLE SET OWNER and ALTER TABLE RENAME TO. Use the following syntax: ALTER TABLE table_name ALTER COLUMN column_name SET DEFAULT default_expression After adding a column, you can optionally define a default value for the column, but this is only applied for new rows inserted into the table. All columns added to Delta tables are treated as NULL for existing rows. When you add a column to an existing Delta table, you cannot define a DEFAULT value.
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