ndb_delete_all -c connection_string tbl_name -d db_name This deletes all rows from the table named tbl_name in the database named db_name. It is exactly equivalent to executing TRUNCATE db_name.tbl_name in MySQL
UPDATE pay_stream a SET a.return_amount = 0 WHERE a.pay_id IN (SELECT b.pay_id FROM pay_main b WHERE b.user_name = '1388888888'); id select_type table partitions type possible_keys key key_len ref rows filtered Extra --- --- --- --- --- --- --- --- --- --- ---...
I have DB, and in it, a table called "xf_user". Under that is a row called "sonnb_xengallery_video_count". There are lot of entries, over 2000, and I want to delete ALL of them from the DB using an SQL query. I can't seem to figure that out. Can anyone point me in the...
To delete all rows in a table without the need of knowing how many rows deleted, you should use theTRUNCATE TABLEstatement to get a better performance. For a table that has aforeign keyconstraint, when you delete rows from the parent table, the rows in the child table will be deleted au...
Notice the WHERE clause in the DELETE statement. The WHERE clause specifies which record(s) should be deleted. If you omit the WHERE clause, all records in the table will be deleted!It is possible to delete all rows in a table without deleting the table. This means that the table ...
1 row in set, 1 warning (0.00 sec) 1. 2. 3. 4. 5. 6. 7. 自动提交关闭: mysql> set autocommit=0; Query OK, 0 rows affected (0.00 sec) mysql> select @@autocommit; +---+ | @@autocommit | +---+ | 0 | +---+ 1 row in set ...
最近,在脉脉上看到一个楼主提出的问题:MySQL数据量大时,delete操作无法命中索引;并且还附上了相关案例截图。 最终,楼主通过开启MySQL分析优化器追踪,定位到是优化器搞的鬼,它觉得花费时间太长。因为我这个是测试数据,究其原因是因为数据倾斜,导致计算出的数据占比较大、花费时间长。
DELETE FROM Newcate: This line specifies the target table from which all rows will be deleted, which is Newcate. Example: MySQL DELETE with ORDER BY for limited number of rows ORDER BY and LIMIT keyword can be used with MySQL DELETE statement to remove only a given number of rows, where...
(any)`一个值`t1.a > any(t2.a) == true`,则返回t1.a的记录 (gcdb@localhost) 17:37:05 [mytest]> select * from t1; +---+ | a | +---+ | 1 | | 3 | | 4 | | 5 | | 7 | +---+ 5 rows in set (0.00 sec) (gcdb@localhost) 17:37:22 [mytest]> select * from...
Basically, what I want to do is find out the weekday (i.e. monday, tuesday, etc.) and store in a variable (i.e. $today=`date +%A`), then delete all the rows in a table (EVENT) where the actual event (event) contains that day. see below ...