Database/Excel导入导出格式问题：如何让导入文件匹配导出文件格式？

Hey there, let's break down why you're seeing those rounding errors and missing data, and how to make your import files match the format of the exported ones perfectly—since you mentioned you're not super familiar with these steps, I'll keep it nice and clear.

The Core Problem #

Even if you set cell formats to "Text" in Excel, it often automatically converts data types (like turning long numbers into scientific notation, truncating decimals, or stripping leading zeros) when you open/save files. Your database program exports plain text-based Excel files (like CSV or TXT), so the key is to make sure your edited import files stay strictly in that plain text format, no Excel auto-magic allowed.

Step-by-Step Solutions #

1. Edit Files the Right Way to Preserve Plain Text

Don't just double-click the file to open it in Excel—this is where Excel starts messing with your data. Instead:

• Open Excel, go to Data > From Text/CSV (older versions might say "From Text")
• Select your exported file, click "Import"
• In the Text Import Wizard:
  • Step 1: Choose "Delimited" (since your exported file uses separators like commas or tabs)
  • Step 2: Check the correct delimiter (match what your exported file uses—you can preview this to be sure)
  • Step 3: For every column, set the "Column data format" to "Text" (this tells Excel to treat everything as plain text, no conversions)
• After editing, save the file as either CSV (Comma Delimited) (*.csv) or Text (Tab Delimited) (*.txt)—these are the exact plain text formats your program expects. Never save as a regular .xlsx file, since it stores extra formatting data that the database program might misinterpret.

2. Prevent Excel from Auto-Transforming Your Data

If you're adding new data to the file:

• For long numbers, leading zeros, or special characters, start with a single apostrophe ' (English half-width) before typing the data. For example: '0012345 or '9876543210987654321—this forces Excel to treat it as plain text immediately.
• If you've already set a column to "Text" but existing data still looks weird, you'll need to re-enter the data or use the Text to Columns tool again (set to delimited, then re-select "Text" for the column) to refresh how Excel stores the data. Just changing the cell format won't fix already-existing converted data.

3. Verify Your Import File Matches the Exported Format

To make sure you got it right:

• Open both your original exported file and your edited import file in Notepad (or any plain text editor)
• They should look identical in structure: each line is a record, columns separated by the same delimiter, no scientific notation, no truncated data
• If the plain text version shows messed-up data, go back to Step 1 and re-edit the file using the Text Import Wizard—this means Excel auto-converted your data during a previous save.

内容的提问来源于stack exchange，提问作者royca