Database

MySQL Advanced chapter （ Gao Yang ） Build table sql Complete statement

one , Single table CREATE TABLE IF NOT EXISTS `article`(`id` INT(10) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,`author_id` INT(10) UNSIGNED NOT...
2020-06-10 23:27 views 23

How to learn Spring ? study Spring What to learn before ?

finish studying java What knowledge should be mastered after the first volume of core technology to learn spring? finish studying Java Basics , Wa...
2019-06-04 08:44 views 33

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

Comparison of data extraction tools ：Kettle,Datax,Sqoop,StreamSets

Tool comparison ：Kettle（ conventional ETL tool ） characteristic ： pure Java Advantages of writing ： Can be found in Windows,linux,Unix On the impl...
2019-04-29 10:58 views 242

Oracle Date function and conversion function

One , Date functions date functions are used to process date Type of data , Subtract two dates by the number of days between the return dates . Ad...
2019-04-25 20:54 views 36

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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