SELECTjson_data:get_path('address','city')AScityFROMmy_table; 3. 使用FLATTEN函数 FLATTEN函数用于将嵌套的JSON数组展开为行。它非常有用,当你需要处理JSON数组时。 示例 假设你的JSON数据包含一个数组: 代码语言:javascript 复制 CREATEORREPLACETABLEmy_table(id
create or replace table monthly_sales(empid int, amount int, month text) as select * from values (1, 10000, 'JAN'), (1, 400, 'JAN'), (2, 4500, 'JAN'), (2, 35000, 'JAN'), (1, 5000, 'FEB'), (1, 3000, 'FEB'), (2, 200, 'FEB'), (2, 90500, 'FEB'), (1, ...
CREATE OR REPLACE DATABASE SYNTHETIC_DATA_DB; CREATE OR REPLACE SCHEMA SYNTHETIC_DATA_SCH; CREATE OR REPLACE TABLE CUSTOMER_INFO ( CUSTOMER_ID INTEGER, 名字STRING, 姓STRING, 年龄INTEGER, 是否活跃 BOOLEAN, 加入日期 DATE ); INSERT INTO CUSTOMER_INFO (CUSTOMER_ID, 名字, 姓, 年龄, 是否活跃, 加...
Snowflake 可以通过 CREATE TABLE 和 ALTER TABLE 两种方式指定/修改 cluster key,其语法为CLUSTER BY。cluster key 不仅可以是列集合,还可以是关于列的表达式: -- cluster by base columnsCREATEORREPLACETABLEt1(c1DATE,c2STRING,c3NUMBER)CLUSTERBY(c1,c2);-- cluster by expressionsCREATEORREPLACETABLEt2(c1time...
这种方法的好处是巨大的：下面是在您自己的 Snowflake 中实现外部表的示例 SQL：create or replace external table ext_miniowith location = @minio_excompstagefile_format = (type = csv)auto_refresh=falserefresh_on_create=false;alter external table ext_minio refresh;现在，您可以查询外部表并将其联接到 ...
CREATE OR REPLACE TABLE Virtual_Column_Example ( colA INT , colB INT , derived INT AS ( IFF(colA = 1 or colB = 1, 1, 0) ) ); INSERT INTO Virtual_Column_Example VALUES (0, 0), (1, 1), (1, 2), (2, 1),(2, 2); SELECT * FROM Virtual_Column_Example; /* --- colA |...
CREATE OR REPLACE EXTERNAL TABLE my_external_table ( id INT, name STRING, age INT ) ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe' WITH SERDEPROPERTIES ( 'serialization.format' = ',', 'field.delim' = ',' ) LOCATION 's3://my-bucket/my-data.json'; 参考链接...
CREATE OR REPLACE TABLE nyctlcyellow_insert AS SELECT * EXCLUDE (value) FROM nyctlcyellow WHERE 1 = 2; -- (创建一个空表的技巧) INSERT INTO nyctlcyellow_insert SELECT * EXCLUDE (value) FROM nyctlcyellow; -- (排除 value 列) ## **Databricks** ...
Comments on constraints Similar to other database objects and constructs, Snowflake supports comments on constraints: Out-of-line constraints support the COMMENT clause within the constraint definition. CREATEORREPLACETABLEuni
CREATEORREPLACETABLEsales_data(idINT,product_name STRING,sales_amountFLOAT,sale_dateDATE);INSERTINTOsales_dataVALUES(1,'Product A',100,'2023-01-01'),(2,'Product B',200,'2023-01-02'),(3,'Product C',150,'2023-01-03'); 1.