现在我们结束操作并退出MySQL客户程序: 5 .创建用户同时授权 mysql> grant all privileges on mq.* to test@localhost identified by '1234'; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.01 sec) PS:必须执行flush privileges; 否则登录时提示...
mysql> CREATE TEMPORARY TABLE actors_j -> (actor_id smallint(5), -> first_name varchar(45), -> last_name varchar(45) -> ); Query OK, 0 rows affected (0.00 sec) mysql> INSERT INTO actors_j -> SELECT actor_id, first_name, last_name -> FROM actor -> WHERE last_name LIKE '...
mysql>CREATE DATABASE IFNOT EXISTS test01 CHARACTERSET utf8 COLLATE utf8_general_ci;Query OK,1 row affected,1 warning(0.00 sec)mysql> show databases;+---+| Database|+---+| information_schema|| db1|| mysql|| performance_schema|| sys|| test|| test01|+---+7 rowsinset(0.00 sec) 3...
Query OK,0rowsaffected (0.01sec) Records:0Duplicates:0Warnings:06.对已经存在的表增加复合主键 mysql>altertablet1->addprimarykey(host_ip,port);7.增加主键 mysql>altertablestudent1->modify namevarchar(10)notnullprimarykey;8.增加主键和自动增长 mysql>altertablestudent1->modify idintnotnullprimarykey ...
Specify MINIMIZE to instruct Oracle to calculate the largest number of records in any block in the table, and limit future inserts so that no block can contain more than that number of records. Restriction: You cannot specify MINIMIZE for an empty table. ...
{SIMPLE|FORCED} |QUERYTRACEON<integer_value>|RECOMPILE|ROBUSTPLAN|USEHINT('hint_name'[ , ...n ] ) |USEPLANN'<xml_plan>'|TABLEHINT(<exposed_object_name>[ ,<table_hint>[ [ , ] ...n ] ] ) |FORTIMESTAMPASOF'<point_in_time>'}<table_hint>::={NOEXPAND[ ,INDEX(<index_...
它只能用于四个 XML 数据类型方法中的一个: exist()、nodes()、query() 和 value(),或者在 IS NULL 和 IS NOT NULL 检查中使用。 494 16 否 TABLESAMPLE 子句只能用于本地表。 495 16 否 返回表列 "%.*ls" 的类型不是创建时的类型。请删除该模块,然后使用该类型的两部分组成的名称重新创建,也可以...
ALTER TABLE dmhr.t2 ALTER COLUMN tp SET DEFAULT SYSDATE; #设置列为系统默认时间 1. 2. 3. 4. MERGE INTO 操作: 使用MERGE INTO 语法可合并 UPDATE 和 INSERT 语句。通过 MERGE 语句,根据一张表(或视图)的连接条件对另外一张表(或视图)进行查询,连接条件匹配上的进行 UPDATE(可能含有 DELETE),无法匹配...
We use the following code to send out emails with query results. Transact-SQL DECLARE @tableHTML NVARCHAR(MAX) ; SET @tableHTML = N'<H3 style="font-family:verdana;color:darkblue;">Header1</H3>' + N'<H5 style="font-family:verdana;color:darkblue;">SubHeader:</H5>' + N'<H6 style...
请问您见过最惊艳的sql查询语句是什么？ 目录 收起 1. 复杂的多表连接查询，如何在一个查询中有效...