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Copy only some columns from one table into another table: INSERT INTO table2 (column1, column2, column3, ...)SELECT column1, column2, column3, ...FROM table1WHERE condition; 1.我的初衷是把同一个表里的某一行的数据进行复制,制作多条重复用来测试使用,比如测试脚本升级后重复数据被处理消失,...
INSERT INTO SELECT SyntaxCopy all columns from one table to another table:INSERT INTO table2 SELECT * FROM table1WHERE condition; Copy only some columns from one table into another table:INSERT INTO table2 (column1, column2, column3, ...) SELECT column1, column2, column3, ... FROM ...
LOCKtables orders read local,order_detail read local;SELECTSUM(total)FROMorders;SELECTSUM(subtotal)FROMorder_detail;Unlock tables; 4. 查看表锁争用情况: 可以通过检查 table_locks_waited 和 table_locks_immediate 状态变量来分析系统上的表锁的争夺,如果 Table_locks_waited 的值比较高,则说明存在着较严重...
If I were doing this I'd just handle all of it from the MySQL prompt by doing the following things: 1. creating a copy of the old users table: Code: CREATE TABLE new_users_table SELECT * FROM live_users_table; 2. Removing any columns from the table that you don't want anymore ...
Reading table informationforcompletionoftable and column names You can turn offthisfeature togeta quicker startupwith-AConnection id:2460607Current database:test GreatDB Cluster[test]>select @@report_host;+---+|@@report_host|+---+|172.16.50.82|+---+1rowinset(0.00sec)GreatDB Cluster[test]>...
Great[test]>select*fromtt1; +---+---+---+---+ |id|dd|c1|c2| +---+---+---+---+ |1|aaa|NULL|NULL| |2|bbb|NULL|NULL| |3|NULL|NULL|NULL| |4|8|NULL|NULL| |5|NULL|NULL|NULL| +---+---+---+---+ 5rowsinset...
I am trying to insert multiple columns with their data from one table into another table, without a common column (i would expect a cross product in the result). I am not sure how that's possible, because each of the two tables have varied number of columns, which rules out UNION on...
Hi folks, What is wrong with the below request? All of the field names are correct but nothing is being inserted into the table value. "INSERT INTO table1 (index1) SELECT index2 FROM table2 WHERE username = admin"; Thank you, Doug...
SELECT employee_id,last_name,department_name FROM employees e JOIN departments d USING (department_id); 你能看出与自然连接 NATURAL JOIN 不同的是,USING 指定了具体的相同的字段名称,你需要在 USING 的括号 () 中填入要指定的同名字段。同时使用 JOIN...USING 可以简化 JOIN ON 的等值连接。它与下面的...