![]() ![]() Optionally sets one or more user defined properties. Sets or resets one or more user defined table options. Therefore, if any TBLPROPERTIES, table_specification, or PARTITIONED BY clauses are specified for Delta Lake tables they must exactly match the Delta Lake location data. You cannot create external tables in locations that overlap with the location of managed tables.įor a Delta Lake table the table configuration is inherited from the LOCATION if data is present. Specifying a location makes the table an external table.įor tables that do not reside in the hive_metastore catalog, the table path must be protected by an external location unless a valid storage credential is specified. If you specify no location the table is considered a managed table and Azure Databricks creates a default table location. LOCATION path Īn optional path to the directory where table data is stored, which could be a path on distributed storage. Optionally specifies whether sort_column is sorted in ascending ( ASC) or descending ( DESC) order.Īn INTEGER literal specifying the number of buckets into which each partition (or the table if no partitioning is specified) is divided. Optionally maintains a sort order for rows in a bucket.Ī column to sort the bucket by. Since a clustering operates on the partition level you must not name a partition column also as a cluster column. If you specify more than one column there must be no duplicates. Specifies the set of columns by which to cluster each partition, or the table if no partitioning is specified.Īn identifier referencing a column_identifier in the table. Optionally cluster the table or each partition into a fixed number of hash buckets using a subset of the columns.Ĭlustering is not supported for Delta Lake tables. Unless you define a Delta Lake table partitioning columns referencing the columns in the column specification are always moved to the end of the table. Optionally specify location, partitioning, clustering, options, comments, and user defined properties for the new table.Įach sub clause may only be specified once.Īn optional clause to partition the table by a subset of columns. You can specify the Hive-specific file_format and row_format using the OPTIONS clause, which is a case-insensitive string map. HIVE is supported to create a Hive SerDe table in Databricks Runtime. The following applies to: Databricks Runtime If USING is omitted, the default is DELTA.įor any data_source other than DELTA you must also specify a LOCATION unless the table catalog is hive_metastore. a fully-qualified class name of a custom implementation of .sources.DataSourceRegister.The following additional file formats to use for the table are supported in Databricks Runtime: Key constraints are not supported for tables in the hive_metastore catalog. To add a check constraint to a Delta Lake table use ALTER TABLE.Īdds an informational primary key or informational foreign key constraints to the Delta Lake table. If no default is specified DEFAULT NULL is applied for nullable columns.ĭefault_expression may be composed of literals, and built-in SQL functions or operators except:Īlso default_expression must not contain any subquery.ĭEFAULT is supported for CSV, JSON, PARQUET, and ORC sources.Īdds a primary key or foreign key constraint to the column in a Delta Lake table.Ĭonstraints are not supported for tables in the hive_metastore catalog. The following operations are not supported:Īpplies to: Databricks SQL SQL warehouse version 2022.35 or higher Databricks Runtime 11.2 and aboveĭefines a DEFAULT value for the column which is used on INSERT, UPDATE, and MERGE. When ALWAYS is used, you cannot provide your own values for the identity column. If the automatically assigned values are beyond the range of the identity column type, the query will fail. Both parameters are optional, and the default value is 1. Assigned values are unique but are not guaranteed to be contiguous. The automatically assigned values start with start and increment by step. This clause can only be used for columns with BIGINT data type. This clause is only supported for Delta Lake tables. When you write to the table, and do not provide values for the identity column, it will be automatically assigned a unique and statistically increasing (or decreasing if step is negative) value. Syntax AS IDENTITY ) ]Īpplies to: Databricks SQL Databricks Runtime 10.3 and aboveĭefines an identity column. Applies to: Databricks SQL Databricks Runtimeĭefines a managed or external table, optionally using a data source.
0 Comments
Leave a Reply. |