For example, the .show tables command returns a list of all tables in the current database. For more information on management commands, see Management commands overview. KQL in other services KQL is used by many other Microsoft services. For specific information on the use of KQL in these ...
In this example, we’ll use MySQL. I’ll aim to use standard syntax where possible, but explain any differences that may apply to other databases. Start Our Query We first need to load the sample database. I’ll assume you’ve done that. If not, you can follow the steps in this po...
选择你的 Azure Database for MySQL 灵活服务器实例。 在左侧窗格的“设置”下,选择“服务器参数” 。 对于slow_query_log 参数,选择“启用” 。 对于其他参数,如 long_query_time 和 log_slow_admin_statements,请参阅慢查询日志文档。 选择“保存”。 可以通过关闭“服务器参数”页返回到日志列表。 使用Azure...
Use the$sizeoperator to query for arrays by number of elements. For example, the following selects documents where the arraytagshas 3 elements. db.inventory.find( {"tags": {$size:3} } ) Query an Array with MongoDB Atlas The example in this section uses thesample movies dataset. To lea...
See another example of comparing two result sets inCompare data at youtube.com. On theOutputtab in theServicestool window, you can see a log of user and internal queries. In theDatabase Explorer(View | Tool Windows |Database Explorer) , open a query console by right-clicking a data sour...
This tutorial explains how to execute MySQL queries using the phpMyAdmin tool. There are two ways to do that with the phpMyAdmin interface. Execute MySQL queries with the SQL tab You can execute a MySQL query towards a given database by opening the database with phpMyAdmin and then clicking ...
This tutorial describes how to use Explain reports to locate and fix problematic (slow) queries. It uses the DBT-3 database and begins with the following simple query example. SELECT * FROM orders WHERE YEAR(o_orderdate) = 1992 AND MONTH(o_orderdate) = 4 AND o_clerk LIKE '%0223';As...
For a full example of secret management, seeTutorial: Create and use a Databricks secret. Read data with JDBC You must configure a number of settings to read data using JDBC. Note that each database uses a different format for the<jdbc-url>. ...
This brings us to the end of this tutorial section, and you’re ready for updating your database with the Update query in SQL. Advanced Techniques Subqueries for Conditional Updates: UPDATE with a significantly more involved example of subqueries: UPDATE employee SET e_age = (SELECT AVG(e_age...
SELECT DISTINCT p FROM Player p, IN (p.teams) AS t WHERE t.city = :cityData retrieved: The players whose teams belong to the specified city. Description: This query is similar to the previous example but adds an input parameter. The AS keyword in the FROM clause is optional. In the ...