將值expr 轉換為 STRING。 此函式與 同 cast(expr AS STRING)義。 如需詳細資訊,請參閱 cast函式。語法複製 string(expr) 引數expr:可以轉換成 STRING的表達式。傳回A STRING。如果expr 不是STRING,則會將結果 STRING 指派為 的預設排序。否則,結果排序會依據 expr的定序。
>SELECT'Spark'; Spark >SELECTCAST(5ASSTRING); 5 >SELECT'O\'Connell'O'Connell > SELECT 'Some\nText' Some Text > SELECT r'Some\nText' Some\nText > SELECT '서울시' 서울시 > SELECT '' > SELECT '\\' \ > SELECT r'\\' \\ ...
> SELECT typeof(5 - '3'); bigint -- Promotes STRING to least common type (INTEGER, STRING --> BIGINT) with runtime check > SELECT c1 = c2 FROM VALUES(10, '10.1') AS T(c1, c2); Invalid input syntax for type numeric: 10.1. To return NULL instead, use 'try_cast'. -- Promo...
For example in a Databricks notebook the $ (dollar) sign introduces a widget and needs to be escaped with \$ to be preserved in a string literal.ExamplesSQL > SELECT 'Spark'; Spark> SELECT CAST(5 AS STRING); 5> SELECT 'O\'Connell' O'Connell> SELECT 'Some\nText' Some Text> ...
("value").cast("string")) .withColumn("newMessage",split(col("value"), " ")) .filter(col("newMessage").getItem(7).isNotNull) .select( col("newMessage").getItem(0).as("uuid"), col("newMessage").getItem(1).as("device_id"), col("newMessage").getItem(2).as("indoor_...
参数值自动连接成一个字符串。 format_string(“(%d)%d,:area_code,:phone_number)有关完整示例,请参阅连接多个参数。 创建间隔 SELECT INTERVAL {{p}} MINUTE SELECT CAST(format_string("INTERVAL '%s' MINUTE", :param) AS INTERVAL MINUTE)Mustache 参数语法重要 以下部分适用于只能在 SQL 编辑器中使用的...
true") .load()val resDF=streamingInputDF .select(col("value").cast("string")) .withColumn("newMessage",split(col("value"), " ")) .filter(col("newMessage").getItem(7).isNotNull) .select( col("newMessage").getItem(0).as("uuid"), col("newMessage").getItem(...
UseSHOW TABLEon the newly created table and it reports astringtype. %sql SHOW CREATE TABLE delta_table1; Create a second Delta table, based on the first, and convert thestringtype column intovarchar. %sql CREATE OR REPLACE TABLE delta_varchar_table1 USING DELTA AS SELECT cast(col1 AS VAR...
)) .add('passenger_count', IntegerType()) )# 将json中的列提取出来lines = (lines.withColumn('data', from_json( col('value').cast('string'), # binary 转 string schema)) # 解析为schema .select(col('data.*'))) # select value...
> SELECT cast(NULL AS STRING); NULL> SELECT cast(-3Y AS STRING); -3> SELECT cast(5::DECIMAL(10, 5) AS STRING); 1.00000> SELECT cast(12345678e-4 AS STRING); 1.5678> SELECT cast(1e7 as string); 1.0E7> SELECT cast(1e6 as string); 1.0> SELECT cast(1e-4 as string); 1.0E-4...