使用BY NAME 子句的 INSERTSQL 复制 > CREATE TABLE target(n INT, text STRING, s STRUCT<a INT, b INT>); > INSERT INTO target BY NAME SELECT named_struct('b', 2, 'a', 1) AS s, 0 AS n, 'data' AS text; > SELECT * FROM target; 0 data {"a":1,"b":2} > CREATE OR ...
STRING, duration DOUBLE, release STRING, tempo DOUBLE, time_signature DOUBLE, title STRING, year DOUBLE, processed_time TIMESTAMP ); INSERT INTO <table-name> SELECT artist_id, artist_name, duration, release, tempo, time_signature, title, year, current_timestamp() FROM <raw-songs-table-name...
-- Use the PARTTIONED BY clause in a table definition>CREATETABLEstudent(universitySTRING, majorSTRING,nameSTRING) PARTITIONEDBY(university, major) >CREATETABLEprofessor(nameSTRING) PARTITIONEDBY(universitySTRING, departmentSTRING);-- Use the PARTITION specification to INSERT into a table>INSERTINTOstu...
UPDATE, MERGE 以及 DELETE 语句都使用相同的语法 LOG ERRORS [INTO [schema.]table] [('simple_...
您可以使用 命令來設定隔離等級 ALTER TABLE。SQL 複製 ALTER TABLE <table-name> SET TBLPROPERTIES ('delta.isolationLevel' = <level-name>) 其中<level-name> 是Serializable 或WriteSerializable。例如,若要將隔離等級從預設值 WriteSerializable 變更為 Serializable,請執行:...
对于每日新增的数据,使用 Deep Clone 同样只会对新数据 Insert 对需要更新的数据 Update 操作,这样可以大大提高执行效率。 CREATE OR REPLACE TABLE delta.delta_{table_name}_clone DEEP CLONE delta.delta_{table_name}; 性能优化:OPTIMIZE & Z-Ordering 在流处理场景下会产生大量的小文件,大量小文件的存在会...
%sql -- Create a table by path CREATE OR REPLACE TABLE delta.`/mnt/delta/events` ( date DATE,eventId STRING,eventType STRING,data STRING) USING DELTA PARTITIONED BY (date); -- Create a table in the metastore CREATE OR REPLACE TABLE events ( date DATE,eventId STRING,eventType STRING,...
Table mapping Step 1 : Create the mapping file Step 2: Update the mapping file Data access Step 1 : Map cloud principals to cloud storage locations Step 2 : Create or modify cloud principals and credentials Step 3: Create the "uber" Principal New Unity Catalog resources Step 0: Attac...
CREATEBLOOMFILTER INDEXONTABLEtable_nameFORCOLUMNS(col_name OPTIONS (fpp=0.1, numItems=50000000)) fpp:假阳性概率,假阳性概率越低,过滤越准确,但索引文件越大(使用更多的位来判断数据是否存在于文件中) numItems:该列可能出现的值的种类 布隆过滤器支持对:byte、short、int、long、float、double、date、timest...
CREATE TABLE IF NOT EXISTS lineage_data.lineagedemo.menu ( recipe_id INT, app string, main string, dessert string ); INSERT INTO lineage_data.lineagedemo.menu (recipe_id, app, main, dessert) VALUES (1,"Ceviche", "Tacos", "Flan"), (2,"Tomato Soup", "Souffle", "Creme Brulee"), (...