exists(expr, func) 複製 exists(query) 引數 expr:ARRAY 表達式。 func:Lambda 函式。 query:任何 查詢。 傳回 布爾值。 Lambda 函式必須產生布爾值,並在一個參數上運作,該參數代表陣列中的元素。 exists(query)只能在 WHERE 子句和少數其他特定案例中使用。 範例 SQL 複製 > SELECT exists(array(1,...
属性键是区分大小写的。 如果property_key不存在,则引发错误,除非已指定IF EXISTS。 示例 SQL -- Remove a table's table properties.>ALTERTABLET UNSET TBLPROPERTIES(this.is.my.key,'this.is.my.key2'); >SHOWTBLPROPERTIES T; key value--- ---... keys other that key and key2 ... ...
fromdatabricksimportsqlimportoswithsql.connect(server_hostname = os.getenv("DATABRICKS_SERVER_HOSTNAME"), http_path = os.getenv("DATABRICKS_HTTP_PATH"), access_token = os.getenv("DATABRICKS_TOKEN"))asconnection:withconnection.cursor()ascursor: cursor.execute("CREATE TABLE IF NOT EXISTS squares ...
IF EXISTS 如果指定 IF EXISTS,如果表没有匹配的约束,则将忽略该语句。示例SQL 复制 > CREATE TABLE persons(first_name STRING NOT NULL, last_name STRING NOT NULL, nickname STRING); > ALTER TABLE persons ADD CONSTRAINT persons_pk PRIMARY KEY(first_name, last_name); > CREATE TABLE ...
Writing data using SQL: --Create a new table, throwing an error if a table with the same name already exists:CREATETABLEmy_tableUSINGcom.databricks.spark.redshiftOPTIONS ( dbtable'my_table', tempdir's3n://path/for/temp/data'url'jdbc:redshift://redshifthost:5439/database?user=username&pas...
_joiners: config of table joining for this feature _kind: Is the featuremultipliable(default) orbase. For example, a feature is multipliable if it should be allowed to be combined with other concepts through the use of a multiplier. Some features such asdaysSinceFirstTransactionare base featu...
If this field is left empty, these schemas should be created in the default catalog. Note that data in other catalogs can still be accessed for model creation by specifying the full name (catalog.schema.table) in the Hightouch SQL interface. Schema: The initial schema to use for the ...
-- Drop table DROP TABLE IF EXISTS mssqltips.low_temps; -- Create table CREATE TABLE mssqltips.low_temps COMMENT 'This is low temp data.'; -- Load table COPY INTO mssqltips.low_temps FROM '/databricks-datasets/weather/low_temps' ...
Cmd 2 will search all accessible databases for a table or view named countries_af: if this entity exists, Cmd 2 will succeed. Cmd 1 will succeed and Cmd 2 will fail. countries_af will be a Python variable representing a PySpark DataFrame. Both commands will fail. No new variables, ...
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