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. In this tutorial, you have learned how to rename a table in a database using the sp_rename stored procedure and SQL Server Management Studio.When you add a column to an existing Delta table, you cannot define a DEFAULT value. Second, type the new name of the table e.g., product_archive and press Enter: The following example illustrates how to rename the product_history table to product_archive.įirst, right-click on the table name and choose Rename menu item: SQL Server rename table using SSMSĪnother way to rename a table is to use the function provided by SQL Server Management Studio. However, it renamed the table successfully. SQL Server returns the following message: Caution: Changing any part of an object name could break scripts and stored procedures. Second, use the sp_rename stored procedure to rename the ntr table to contracts in the sales schema: EXEC sp_rename 'ntr', 'contracts' Note that both the old and new name of the table whose name is changed must be enclosed in single quotations.įirst, create a new table named ntr for storing sales contract’s data: CREATE TABLE ntr ( The following shows the syntax of using the sp_rename stored procedure for changing the name of a table: EXEC sp_rename 'old_table_name', 'new_table_name'Ĭode language: SQL (Structured Query Language) ( sql ) However, it does provide you with a stored procedure named sp_rename that allows you to change the name of a table. SQL Server does not have any statement that directly renames a table. Summary: in this tutorial, you will learn how to rename a table using Transact SQL and SQL Server Management Studio.
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