有关Delta Lake 的 add constraint 和 alter column 的示例,请参阅更新Delta Lake 表架构 Azure Databricks 的约束SQL 复制 -- RENAME table > DESCRIBE student; col_name data_type comment --- --- --- name string NULL rollno int NULL age int NULL # Partition Information # col_name data_type...
Applies to: Databricks SQL Databricks Runtime 12.2 LTS and above Unity Catalog only Preview This feature is in Public Preview. Adds a column mask function to anonymize sensitive data. All subsequent queries from that column will receive the result of evaluating that function over the column in pl...
Databricks SQL Databricks Runtime 10.4 LTS 和更新版本 僅限Unity 目錄 改變外部位置的屬性,或重新命名位置。 語法 複製 ALTER EXTERNAL LOCATION location_name { RENAME TO to_location_name | SET URL url_str [ FORCE ] | SET STORAGE CREDENTIAL credential_name | [ SET ] OWNER TO principal } ...
The fully qualified name of the field to be added to an existing column. All components of the path to the nested field must exist and the field name itself must be unique. DEFAULT default_expression Applies to: Databricks SQL SQL warehouse version 2022.35 or higher Databricks Runtime 1...
Remove Column with the SQL ALTER TABLE STATEMENT We use the ALTER TABLE command to remove, change, and create columns. In this example, we determined that the photo stored in the database and the image’s file name are no longer needed. ...
我想提高10+百万记录大表中数字列的精度。标准的方式是ALTERTABLEmytableALTERCOLUMN mycolumn TYPE numeric(15,6)将锁定表。这是一个高度事务性的表。有没有一种方法可以做到这一点,而不锁定表,不重新创建表,复制数据,重命名/交换表?我目前运行的是一个被篡改的postgres 9.5 ...
修改列:ALTER TABLE table_name MODIFY column_name datatype; 删除列:ALTER TABLE table_name DROP COLUMN column_name; 添加约束:ALTER TABLE table_name ADD CONSTRAINT constraint_name constraint_definition; 应用场景 当你需要对数据库表结构进行调整时,比如增加一个新的字段来存储额外的信息,或者修改现有字段的...
有关Delta Lake 的 add constraint 和 alter column 的示例,请参阅更新Delta Lake 表架构 Azure Databricks 的约束SQL 复制 -- RENAME table > DESCRIBE student; col_name data_type comment --- --- --- name string NULL rollno int NULL age int NULL # Partition Information # col_name data...
Databricks SQL Databricks Runtime Adds, drops, renames, or recovers partitions of a table. Managing partitions is not supported for Delta Lake tables. Syntax ALTERTABLEtable_name{ADDPARTITIONclause|DROPPARTITIONclause|PARTITIONSETLOCATIONclause|RENAMEPARTITIONclause|RECOVERPARTITIONSclause} ...
Learn about table partitions in Databricks SQL and Databricks Runtime. SHOW PARTITIONS - Azure Databricks - Databricks SQL Learn how to use the SHOW PARTITIONS syntax of the SQL language in Databricks SQL and Databricks Runtime. ALTER TABLE … COLUMN clause - Azure Databricks -...