SQL

Sql What is the order of execution of ?

Total number 150 piece / Zhang Junhong learned it Sql, Or I know about it Sql People in the world , Should be able to write the following line ...
2019-06-02 10:00 views 12

Record a million data SQL Statement optimization

cause ： The company's order data is increasing day by day , Make the order table to do statistics query speed is abnormal slow . The average query...
2019-05-28 18:03 views 24

spark.sql.shuffle.partitions and spark.default.parallelism The difference between

About spark Setting task parallelism , There are two parameters that we often encounter ,spark.sql.shuffle.partitions and spark.default.parallel...
2019-02-27 10:30 views 71

mysql Of substring_index Field interception

SELECT substring_index(data_value, ' Organization type ', 1),data_value  FROM `test` where data_value like '% Organization type %';SELECT CONCAT(&...
2018-11-10 17:32 views 55
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