{ "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.25", "eval_cost": "0.10", "prefix_cost": "0.35", "data_read_per_join": "56" }, "used_columns": [ "id"...
How to replace a character in some specific word in a text file using python I got a task to replace "O"(capital O) by "0" in a text file by using python. But one condition is that I have to preserve the other words like Over, NATO etc. I have to replace on... ...
-- 注意,以下情况适用于辅助索引EXPLAINSELECT*FROMcityWHEREcountrycodeNOTIN('CHN','USA');+---+---+---+---+---+---+---+---+---+---+---+---+|id|select_type|table|partitions|type|possible_keys|key|key_len|ref|rows|filtered|Extra|+---+---+---+---+---+---+---+-...
I got a task to replace "O"(capital O) by "0" in a text file by using python. But one condition is that I have to preserve the other words like Over, NATO etc. I have to replace on... Why is the ip address 10.1.1.97 routed to 10.1.1.64/26 network ...
Data Type: float Explanation: The price of the product in dollars. ``` 在这个例子中,"explain"字段用于解释数据集中一个字段的含义。它指出了该字段的列名、数据类型和具体含义。通过这个"explain"字段,数据分析人员就能更好地理解该字段的作用和意义,从而更准确地进行数据分析和预测。 六、实际例子:解析查询...
id) FROM big_data_user bdu2 GROUP BY bdu2.phone HAVING count(*)> 1) b); EXPLIAN 出来的信息有 12 列,分别是 id、select_type、table、partitions、type、possible_keys、key、key_len、ref、rows、filtered、Extra id - 查询标识 查询标识,表示 SQL 语句中执行 SELECT 子句或者是操作的顺序。
A WHERE clause is used to restrict which rows to match against the next table or send to the client. Unless you specifically intend to fetch or examine all rows from the table, you may have something wrong in your query if the Extra value is not Using where and the table join type ...
1CALL generateBigDataUser(1000000); 1. 在调用存储过程的过程中内存表大小的问题抛出 “The table ‘big_data_memory’ is full”,这是就需要我们修改一下 MySQL 的配置信息。 1# 1. 查看 tmp_table_size 大小, tmp_table_size: 控制内存临时表的最大值, 超过限值后就往硬盘写, 写的位置由变量 tmpdir...
[2] EXPLAIN INTO:https://blogs.oracle.com/mysql/post/explain-into-and-explain-for-schema-in-mysql-81-and-82 [3] hypergraph-optimizer:https://blogs.oracle.com/mysql/post/the-mysql-hypergraph-optimizer-now-available-in-heatwave-mysql
The request accepts the following data in JSON format. gremlin The Gremlin explain query string. Type: String Required: Yes HTTP/1.1 200output If the action is successful, the service sends back an HTTP 200 response. The response returns the following as the HTTP body. ...