INSERT IGNORE INTO employeeVALUES ( 26, '张三', '男', 5, 18, '2019-12-25', 10, 6000, NULL, 'zhangsan@shuguo.com');Query OK, 0 rows affected, 1 warning (0.00 sec)show warnings;+---+---+---+| Level | Code | Message |+---+---+---+| Warning | 1062 | Duplicate entry...
$sql = "UPDATE categories SET display_order = $ordinal WHERE id = $id"; mysql_query($sql); } 1. 2. 3. 4. 即是循环一条一条的更新记录。一条记录update一次,这样性能很差,也很容易造成阻塞。 那么能不能一条sql语句实现批量更新呢? mysql并没有提供直接的方法来实现批量更新,但是可以用点小技巧...
问DB2是否有"insert或update“语句？EN主题中提到的三种语句都是没有返回值的，所以我们实现起来也最简单...
A materialized query table A table that is implicitly created for an XML column In an IMS or CICS® application, theDb2subsystem that contains the identified table or view must be a remote server that supports two-phase commit. column-name,... ...
Insert: Hierarchy Table Name = schema.name ID = ts,n Update: Hierarchy Table Name = schema.name ID = ts,n Delete: Hierarchy Table Name = schema.name ID = ts,n Insert: Materialized Query Table = schema.name ID = ts,n Update: Materialized Query Table = schema.name ID = ts,n ...
mysql>BEGIN;Query OK, 0 rows affected (0.00 sec)mysql>INSERT INTO hero VALUES(4,g关羽,蜀); 此时T2进入阻塞状态,我们再使用SHOW ENGINE INNODB STATUS看一下加锁情况: 可见T2对主键值为8的聚簇索引记录加了一个插入意向锁(就是箭头处指向的lock_mode X locks gap before rec insert intention),并且处...
Query OK,5rows affected (0.36sec) mysql>select*fromtest; Emptyset(0.00sec) mysql> insert into `test` values (1,'oldboy'),(2,'oldgirl'),(3,'inca'),(4,'zuma'),(5,'kaka'); Query OK,5rows affected (0.10sec) Records:5Duplicates:0Warnings:0mysql>select*fromtest;+---+---+ | ...
\tb.dump tables=tb1 如果是导出多个表,tables=(tb1、tb2) 2、exp usr/pwd@sid file=c:\tb.dump –全部导出 3、exp usr/pwd@sid file=c:\tb.dump owner=(system,sys) 将用户system和sys用户下的表都导出 4、exp usr/pwd@sid file=c:\tb.dump tables=tb1 query=\”where name=’ha’\” 注意...
v.+n. insert disk,insert card,insert word 权威英汉双解 英汉 英英 网络释义 insert 显示所有例句 v. 1. ~ sth (in/into/between sth) 插入;嵌入to put sth into sth else or between two things 2. (在文章中)添加,加插to add sth to a piece of writing ...
[ASC | DESC], ...]12[HAVING where_definition]13[ORDER BY {unsigned_integer | col_name | formula} [ASC | DESC],...]14[LIMIT [offset,]rows|rows OFFSET offset]15[PROCEDURE procedure_name(argument_list)]16[FOR UPDATE | LOCK IN SHARE MODE]]1718SELECT用于检索从一个或多个表中选取出的...