SQL Copy ALTER TABLE table_name ALTER COLUMN column_name SET DEFAULT default_expression SyntaxCopy { ADD [ COLUMN | COLUMNS ] ( { { column_identifier | field_name } data_type [ COLLATE collation_name ] [ DEFAULT clause ] [ COMMENT comment ] [ FIRST | AFTER identifier ] [ MASK...
[SPARK-39319] [CORE][SQL] Make query contexts as a part of SparkThrowable [SPARK-40085] [SQL] Use INTERNAL_ERROR error class instead of IllegalStateException to indicate bugs [SPARK-40001] [SQL] Make NULL writes to JSON DEFAULT columns write ‘null’ to storage [SPARK-39635] [SQL] Supp...
SQLコピー -- Add a primary key>CREATETABLEpersons(first_nameSTRINGNOTNULL, last_nameSTRINGNOTNULL, nicknameSTRING); >ALTERTABLEpersonsADDCONSTRAINTpersons_pk PRIMARYKEY(first_name, last_name);-- Add a foreign key>CREATETABLEpets(nameSTRING, owner_first_nameSTRING, owner_last_nameSTRING)...
Databricks SQL Databricks Runtime 將資訊主鍵或資訊外鍵新增為CREATE TABLE或CREATE MATERIALIZED VIEW語句的一部分。 若要在建立 table 之後,將檢查 constraint 新增至 Delta Lake table,請使用ALTER TABLE。 語法 使用table_constraint子句來定義跨越多個 columns 的條件約束,或將語法與 column 定義...
sql-parse-error sys-path-cannot-compute-value table-migrated-to-uc to-json-in-shared-clusters unsupported-magic-line Utility commands logs command ensure-assessment-run command update-migration-progress command repair-run command workflows command open-remote-config command installations command report-...
Databricks automatically generates lineage based on all Databricks SQL notebooks that have been run for the last 30 days: Data lineage for a satellite table in the Raw Data Vault The screenshot above shows lineage down to the column level. This helps to understand ...
SQL解析为Optimizer命令,进行执行前校验 当用户执行一条上面的sql后,首先会经历sql解析阶段。Spark使用的是开源组件antlr4将输入SQL解析为AST树。它的解析语法在DeltaSQLBase.g4文件中。 | OPTIMIZE (path=STRING | table=qualifiedName) (WHERE partitionPredicate = predicateToken)? (zorderSpec)? #optimizeTable ...
在Databricks中使用SQL语句来创建表,可以按照以下步骤进行操作: 1.打开Databricks的工作区,进入所需的notebook或者Dashboard. 2.在代码单元格中输入以下SQL语句来创建表: ``` CREATE TABLE <表名> ( <列名1> <数据类型1>, <列名2> <数据类型2>, ... ); ``` 3.将上述代码中的`<表名>`替换为表的名...
%sql 1. 一,管理数据库 常用的数据库命令,切换当前的数据库、显示数据库列表、表列表、视图列表和列信息: use db_name show databases show tables [in db_name] show views [in db_name] show columns in db_name.table_name 1. 2. 3. 4. ...
Delta Lake validates schema on write, ensuring that all data written to a table matches the requirements you’ve set. Schema enforcement Constraints on Databricks Delta Lake generated columns Enrich Delta Lake tables with custom metadata Managing files and indexing data with Delta Lake ...