Query OK, 0 rows affected (0.15 sec) mysql> insert into t11(name) values('Jack'),('Tom'),('Mark'),('Black'); Query OK, 4 rows affected (0.06 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> create table t12(id int primary key auto_increment,name char(20)); Query OK, 0 ro...
--需要归档的数据量mysql admin@192.168.58.3:employees>selectcount(*)fromemployeeswherefirst_name='Anneke';+---+|count(*)|+---+|225|+---+1rowinsetTime:0.025s--执行归档操作# pt-archiver--source h=192.168.58.3,P=3306,u=admin,D=employees,t=employees,A=utf8 --dest h=192.168.58.3,P=3...
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. Options that can be used with ndb_delete_all are shown in the following table. Additional descriptions follow the table. Table...
Query OK, 0 rows affected (0.00 sec) ---TRANSACTION 146831, ACTIVE 24 sec 2 lock struct(s), heap size 360, 1 row lock(s) MySQL thread id 1, OS thread handle 0x7f61ab1c7700, query id 881 localhost msandbox cleaning up TABLE LOCK table `test`.`tu` trx id 146831 lock mode IX ...
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 --- --- --- --- --- --- --- --- --- --- --...
MySQL中的DELETE语句用于删除表中的数据。当涉及到关联删除时,通常是指在一个表中删除记录的同时,也需要删除与之相关联的其他表中的记录。这通常通过外键约束和级联删除来实现。 优势 数据一致性:确保删除操作不会导致孤立的数据记录,保持数据库的完整性。 简化操作:通过一次操作即可删除多个表中的相关数据,减少手动...
If theORDER BYclause is specified, the rows are deleted in the order that is specified. TheLIMITclause places a limit on the number of rows that can be deleted. These clauses apply to single-table deletes, but not multi-table deletes. ...
我们发现union all 的所用的 type【type为显示连接使用了何种类型】 为ref 而or和in为range【ref连接类型优于range,相差不了多少】,而查询行数都一样【看rows字段都是为3】。 从整个的过程来看,在索引列使用常数or及in和union all查询相差不了多少。
I want to delete row in 'Play Table' by Id, and want to update 'Game Table' by the GameId of 'Play Table' I can do this with seperate queries, but I want to do it at once. I tried but no luck. How can I do it? select gameId from play where id='2' // returns 5 ...
$db = mysql_select_db($base, $in[$id]) or die (mysql_error()); $res = mysql_query( $req ) or die (mysql_error()); print "<br>Affectés".mysql_affected_rows(); return $res; } } // Openning database--- $sql_fam= new sql_ourfamily(); $sql_fam->open(); // ...