create mode selected for existing table

时间: 2023-05-23 09:05:05 浏览: 194

Chucks_VBA_Reference_rev17.docx

### Chuck’s Microsoft VBA Programming Reference #### Excel Shortcuts and Optimization Techniques **ShortCutKeys (Page 15)** This section lists the shortcut keys that can be used in VBA to enhance productivity when working with Excel. These shortcuts can help automate repetitive tasks by integrating them into macros. **Excel 2007 Resources (Page 15)** This page provides links or references to additional resources for Excel 2007. These resources might include online tutorials, forums, or documentation that can help users and developers get more out of their VBA applications. **Determine Excel Version (Page 15)** The `Application.Version` property is used to determine the version number of Excel. For example, it returns "11.0" for Excel 2003 and "12.0" for Excel 2007. This information can be crucial for ensuring compatibility between different versions of Excel and the VBA code. #### Optimizing Excel Performance **Resetting Excel Custom Configuration File (Page 16)** Instructions on how to reset the custom configuration file of Excel. This can be useful when dealing with issues caused by corrupted settings. **Start VBE From Button (Page 16)** A guide on how to create a button that opens the Visual Basic Editor (VBE) directly from within Excel. This can be particularly helpful for frequent VBA developers. **Show Developer Toolbar Tab (Page 16)** Steps to display the Developer toolbar tab, which provides easy access to various development tools and features. **Optimizing Excel Performance (Page 16)** Tips and techniques for optimizing the performance of Excel, including speeding up macros and reducing flickering during macro execution. **Speeding Up Macros (Page 16)** Specific methods for improving the speed of VBA macros, such as suspending alerts, calculations, and update links. **Stopping Screen Flickering with Macros (Page 16)** Techniques for preventing screen flickering while macros are running, enhancing user experience. **Suspending Alerts (Page 16)** Instructions on how to temporarily disable alerts to avoid interruptions during macro execution. **Suspending Calculations (Page 16)** Guidance on suspending automatic calculation during macro execution to improve performance. **Suspending Update Links (Page 17)** Methods for suspending updates to external links during macro execution. **Disable Events (Page 17)** Details on disabling events, which can significantly reduce overhead and improve macro performance. **Use “With” Statement (Page 17)** Explanation of using the `With` statement to group statements that operate on the same object, thus making the code more efficient. **Use “vbNullString” (Page 17)** Instructions on using `vbNullString` to handle empty strings efficiently. **Ignoring Excel Errors (Green Corners in Cells) (Page 17)** Techniques for handling errors that cause green corners in cells, typically indicating formula errors. **Avoid Clipboard (Page 17)** Recommendations for avoiding the use of the clipboard in VBA, as it can be a significant performance bottleneck. **Release Memory (Page 18)** Strategies for releasing memory in VBA to prevent memory leaks and ensure optimal performance. **Checking Condition (Page 18)** Tips for efficiently checking conditions in VBA code to make the logic clearer and more concise. **Toggle a Variable (Page 18)** Methods for toggling the state of a variable, often used for switching between two states. **Color Index Table (Page 19)** A table listing the color index values available in Excel, which can be used to set cell colors programmatically. **Display a Table at a Selected Range Showing Color Index Values (Page 19)** Instructions on how to display a table showing color index values at a selected range in the worksheet. **Color Index (Excel 2007) (Page 20)** Explanation of the color index in Excel 2007, which uses a different scheme compared to earlier versions. **Determine if Cell is Within Range Using Intersect (Page 20)** Code examples for determining if a specific cell is within a given range using the `Intersect` method. **Use Union to Combine Ranges (Page 20)** Instructions on combining multiple ranges using the `Union` method, which can be useful for performing operations across multiple areas of a worksheet. **Commenting a Section of Code – Quickly (Page 20)** Quick methods for commenting out sections of code, which is essential for debugging and maintaining code clarity. **Add Comments Showing Cell Formulas and Values (Page 21)** Methods for adding comments that display both the formula and value of a cell, which can be useful for documentation purposes. **Read Comments from a Cell (Page 21)** Instructions on reading comments attached to a cell, which can be useful for extracting metadata or notes stored in comments. **Adding Comments to a Cell (Page 21)** Guidance on adding comments to cells, which can be used for providing context or notes. **Adding a Picture to a Cell Comment (Page 21)** Steps for adding pictures to cell comments, which can be useful for visual documentation. **Adding a Picture to a Cell Comment With Width and Height (Page 22)** Instructions on adding a picture to a cell comment with specified width and height, allowing for precise control over the image size. **GetFormula() Custom Excel Function (Page 22)** Details on a custom function that retrieves the formula of a cell, which can be useful for analyzing or manipulating formulas programmatically. **Workbooks (Page 23)** Various workbook-related functions, including determining if a workbook exists, whether it is open, saving workbooks, and managing workbook files. **Determine if a Workbook Exists – Only 2003 (Page 23)** Instructions for determining if a workbook exists in Excel 2003, which might involve checking the file system or using specific VBA techniques. **Determine if Workbook Exists – Excel 2007 (Page 23)** Methods for determining if a workbook exists in Excel 2007, potentially involving different approaches due to changes in the API. **Determine if a Workbook Is Open (Page 24)** Techniques for checking if a specific workbook is currently open, which can be important for managing open files and avoiding conflicts. **Save Workbook (Page 25)** Code examples for saving a workbook, including options for saving as a new file or updating an existing one. **Select an Active Workbook with Code (Page 25)** Instructions on selecting an active workbook using VBA code, which can be useful for automating workbook selection based on specific criteria. **Adding Workbooks (Page 25)** Methods for adding new workbooks programmatically, which can be useful for creating templates or generating new documents. **Opening Workbooks (Page 25)** Instructions on opening existing workbooks using VBA, including options for opening in read-only mode or with specific settings. **Opening a Workbook and Saving As for Unauthorized Personnel (Page 25)** Guidance on handling scenarios where unauthorized personnel need to save workbooks under different names or locations, ensuring security and compliance. **Save Workbook with New Name (Page 26)** Code examples for saving a workbook with a new name, which can be useful for version control or archiving purposes. **Closing and Saving a Workbook (Page 26)** Instructions on closing a workbook after saving changes, which ensures that the data is preserved. **Delete a Workbook (Page 26)** Methods for deleting a workbook from the application, which can be useful for managing workspace or removing unnecessary files. **Display Recently Opened Files (Page 27)** Techniques for displaying a list of recently opened files, which can be useful for quick access or auditing purposes. **Updating/Not Updating Links (Page 27)** Instructions on controlling whether external links are updated automatically or not, which can be crucial for maintaining data integrity. **List Links (Page 27)** Code examples for listing all external links in a workbook, which can be useful for identifying dependencies or potential issues. **Call Macro in Another Workbook (Page 27)** Instructions on calling a macro located in another workbook, which can be useful for reusing code or coordinating actions across multiple documents. **Close a File/Close Excel with a Macro (Page 27)** Code examples for closing a specific file or exiting Excel entirely using a macro, which can be useful for automating the cleanup process. **Create List of Workbooks/Worksheets in a Listbox (Page 28)** Methods for creating a list of open workbooks or worksheets in a ListBox control, which can be useful for presenting options to the user or organizing documents. **Change Standard Chart Colors for a Workbook – Only 16 Colors (Page 28)** Instructions on changing the standard chart colors in a workbook, limited to 16 colors, which can be useful for customizing the appearance of charts. **Change Standard Chart Colors for a Workbook – All 56 Colors (Page 29)** Methods for changing the standard chart colors in a workbook, utilizing all 56 available colors, offering greater customization options. **Convert Color Decimal to RGB Values (Page 30)** Code examples for converting decimal color values to RGB format, which can be useful for manipulating colors programmatically and ensuring consistency across different platforms. These topics provide a comprehensive overview of VBA programming for Excel, covering a wide range of techniques and best practices for optimizing performance, managing workbooks, and enhancing user experience.

A：这个问题是关于数据库的。当我们需要在一个已经存在的表中添加新的列时，我们需要指定添加模式。在 SQL 中，我们可以使用 ALTER TABLE 语句来添加新的列，同时指定相应的模式。例如，如果我们要给名为 "customers" 的表添加一个新的列 "age"，类型为整数，可以使用以下语句： ``` ALTER TABLE customers ADD COLUMN age INT; ``` 在这个例子中，ADD COLUMN 操作指定了添加模式，同时列出了要添加的列名和类型。这将在现有的 "customers" 表中创建一个名为 "age" 的新列，该列将存储整数类型的数据。

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create mode selected for existing table

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（1） 输入整数元素序列并创建序列表 （2） 实现序列表的遍历 （3） 在序列表中搜索某个元素，如果搜索成功

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