CONVERT 在Delta Lake 事務歷史記錄中填入目錄資訊,例如架構和數據表屬性。 如果基礎目錄已轉換成 Delta Lake,且其元數據與目錄元數據不同,則會擲回 convertMetastoreMetadataMismatchException。 使用Databricks Runtime 時,如果您想要 CONVERT 覆寫Delta Lake 事務歷史記錄中現有的元數據,請將 SQL 組態 spark.databrick...
Databricks SQL Databricks Runtime 13.3 LTS 及更高版本 将TIMESTAMP_NTZ转换为另一个时区。 如果输入列的类型为TIMESTAMP_NTZ、TIMESTAMP或DATE,则在时区转换之前会将输入列转换为STRING类型。 语法 convert_timezone([sourceTz, ]targetTz, sourceTs)
CREATE FUNCTION (SQL) CREATE FUNCTION (外部) 創建地點 CREATE MATERIALIZED VIEW CREATE RECIPIENT CREATE SCHEMA CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE 數據表屬性和數據表選項 CREATE TABLE 使用 Hive 格式 CREATE TABLE CONSTRAINT CREATE TABLE USING CREATE TABLE LIKE CREATE VIEW CREATE...
Databricks SQL Databricks Runtime 如果群組中至少有一個 值expr為 true,則傳true回 。any聚合函數與 max aggregate函式同義,但僅限於布爾自變數。 函式也是bool_or聚合函數的同義字。 語法 any(expr) [FILTER ( WHERE cond ) ] 您也可以使用 子句,將此函式叫用OVER為視窗函式。
frompyspark.sql.functionsimportcolimportpyspark.sql.functionsasFFeature(_name='total_custs',_base_col=col('ss_customer_sk'),_agg_func=F.approx_count_distinct) Beyond defining a feature as a base column with an aggregate function, composite features that reference previously defined features can ...
Database stores for the MLflow Tracking Server. Support for a scalable and performant backend store was one of the top community requests. This feature enables you to connect to local or remote SQLAlchemy-compatible databases (currently supported flavors include MySQL, PostgreSQL, SQLite, and MS SQ...
# Calculate accuracy on the testing setimportpyspark.sql.functionsasF check=s_predict_test.withColumn('correct',F.when(F.col('Label')==F.col('prediction'),1).otherwise(0))check.groupby('correct').count().show()accuracy=check.filter(check['correct']==1).count()/che...
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CREATE FUNCTION (SQL) CREATE FUNCTION (External) CREATE LOCATION CREATE MATERIALIZED VIEW CREATE RECIPIENT CREATE SCHEMA CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE Table properties and table options CREATE TABLE with Hive format CREATE TABLE CONSTRAINT CREATE TABLE USING CREATE ...
SQL 資料處理流程語法 Databricks SQL 也可讓您使用EXPLAIN語句來檢查查詢所產生的邏輯和實體計劃。 EXPLAIN 您可以使用 Delta Lake SQL 語句來管理以 Delta Lake 格式儲存的資料表: CACHE SELECT CONVERT TO DELTA DESCRIBE HISTORY FSCK REPAIR TABLE GENERATE ...