2012年计算机二级Access考试复习笔记9
上机复习 第二章表 一、 1、建立表,修改表。 2、导入、联接外部数据。 二、 数据表视图: 1、添加记录,修改记录,删除记录 2、排序记录(按照一个字段排序,按照多个字段排序) 3、修改表的外观(格式菜单下命令:行高,列宽,字体,单元格显示效果,表格背
上机复习
第二章 表
一、
1、建立表,修改表。
2、导入、联接外部数据。
二、
数据表视图:
1、添加记录,修改记录,删除记录
2、排序记录(按照一个字段排序,按照多个字段排序)
3、修改表的外观(格式菜单下命令:行高,列宽,字体,单元格显示效果,表格背景,冻结列,取消冻结列,隐藏列,取消隐藏列)
设计视图:1、添加字段 2、修改字段名3、删除字段 4、修改数据类型 5、修改字段属性(字段大小、格式 、默认值 、有效性规则 、有效性文本 、输入掩码 、必填字段 、索引 、标题) 5、添加字段说明 6、设置关键字(一个字段和多个字段) 7、拆分表 8、修改表结构中的字段次序
三、操作细节
1、如何添加图片
2、有效性规则的要求。对规则的的描述一定要由相应的运算符号来表示。
3、关键字段的要求
4、日期的要求
5、必填字段的要求
6、输入掩码的特殊符号
7、对多个字段如何排序
8、对表的操作时候,需要知道某些操作是无法撤销的,所以进行操作之前,最好对自己操作的表进行备份,在确保自己没有任何错误的前提下再把自己备份的表删除。
9、在自己实际的操作过程中,有可能出现的错误是:选错字段或选错字段属性。
10、设置默认值,一定要和所在的数据类型相匹配,文本型字段值需要添加英文半角状态下的 ” ”,日期值需要半角状态下添加#,
11、在导入数据和联接数据时,需要切换相应的数据类型,才能显示你想要的文件。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



The advantage of multithreading is that it can improve performance and resource utilization, especially for processing large amounts of data or performing time-consuming operations. It allows multiple tasks to be performed simultaneously, improving efficiency. However, too many threads can lead to performance degradation, so you need to carefully select the number of threads based on the number of CPU cores and task characteristics. In addition, multi-threaded programming involves challenges such as deadlock and race conditions, which need to be solved using synchronization mechanisms, and requires solid knowledge of concurrent programming, weighing the pros and cons and using them with caution.

The main reasons why you cannot log in to MySQL as root are permission problems, configuration file errors, password inconsistent, socket file problems, or firewall interception. The solution includes: check whether the bind-address parameter in the configuration file is configured correctly. Check whether the root user permissions have been modified or deleted and reset. Verify that the password is accurate, including case and special characters. Check socket file permission settings and paths. Check that the firewall blocks connections to the MySQL server.

How to avoid the third-party interface returning 403 error in the Node environment. When calling the third-party website interface using Node.js, you sometimes encounter the problem of returning 403 error. �...

SQL IF statements are used to conditionally execute SQL statements, with the syntax as: IF (condition) THEN {statement} ELSE {statement} END IF;. The condition can be any valid SQL expression, and if the condition is true, execute the THEN clause; if the condition is false, execute the ELSE clause. IF statements can be nested, allowing for more complex conditional checks.

Methods to solve the cross-domain problem of Vue Axios include: Configuring the CORS header on the server side using the Axios proxy using JSONP using WebSocket using the CORS plug-in

Get ComponentVerify in EasyWechat5.5...

This article will explain how to improve website performance by analyzing Apache logs under the Debian system. 1. Log Analysis Basics Apache log records the detailed information of all HTTP requests, including IP address, timestamp, request URL, HTTP method and response code. In Debian systems, these logs are usually located in the /var/log/apache2/access.log and /var/log/apache2/error.log directories. Understanding the log structure is the first step in effective analysis. 2. Log analysis tool You can use a variety of tools to analyze Apache logs: Command line tools: grep, awk, sed and other command line tools.

Question: Can MySQL run on macOS? Answer: Yes. Specific instructions: It can be installed through the official MySQL installer. You can use Homebrew to install, providing command-line-driven installation methods and dependency management. Create databases and tables using the MySQL command line client. Optimize query performance and understand indexing, query cache and database standardization. Avoid conflicting version issues and use a single installation method. Ensure secure configuration, use strong passwords and access controls.
