if you multiply this with rows you will get how many rows this query will return to preceding queries. Filtered The percentage of rows that will be filtered by using where conditions or things like that. Easy search for performance bottlenecks Quick jump to any step of query optimization to review, execute, or save queries Tracking of session statistics.Rows The number of rows MySQL estimate it will need to read to find the desired row.Ref This shows which columns or constants are being used to lookup values in the index name in the key column.based on this value you can either play with your query to reduce the effect or change the structure of your tables to a better one if you weren't using the allocated bytes in your table. Key_len The number of bytes MySql will use in the index.Key The one index that MySQL decided to use to optimize the access of the wanted data.Possible Keys This will try to take all the columns used in the query and use them as possible columns to filter upon or use for execution.Type Some say its called access_type, and those types are: - ALL: find data in the table through normal scan (normal select queries) - index: find data through an indexed column (nice to be this way) - range: meaning it can limit the results based on the indexed column and take a range (fast query) - ref: meaning this will match a ref from other tables - eq_ref: if the ref to a unique key, meaning it will stop the moment it matches a row - const, system: matches a const (very fast usually).Apache Druid is a popular database often used for. usually, its always like that for join commands. This blog post provides a simple workaround for querying Apache Druid using a traditional SQL editor. In the Export Data dialog, click Export to File. On the toolbar, click the Export Data icon () and select Export to File. Right-click a query and select Export Data to &File. Table This will refer to the table it's getting the data from for current query, sometimes it says instead of the table name meaning that this join will wait for its internal command id=4 as a table to get data from. To export data to a file, perform one of the following actions: Right-click a result set, a table, or a view, select Export Data.select * from - Union: join, union or such commands - Union Result: the place where it joins the results of all joins. (select actor_id, as something from the table) - Derived: ex. Select Type As for this, It could have one of the following values (the is the focus): - SubQuery: ex.but, if you have a joined query and a subquery you will notice it will show you main query then subquery 2nd then the join 3rd. if you have a normal query you will see only 1. ID This id will represent the id of the statement MySQL is going to execute in order.Now let's explain whats inside that table.

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