VirtualMV/MySQL/Interactive Help Desk

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Instructions

On this page you can post some MySQL code that you are having trouble with.

• Please keep the code "simple" concentrating on the problem ... not a lot of code with a "small" problem.
• Post a tweet including the #vmvwiki tag so that we know there is a problem waiting to be solved.
• Paste the following wiki code when you edit, and put your code where shown.

{{vmv:Source|<source lang="javascript">
Code in here
</source>}}

Posting reward scheme

The rules here are:

• if it is a complex problem, and you solve it you should be rewarded with a small choc from the person posting, however
• if it is easy to solve a more substantial chocolate "gift" (like a large chocolate fish would be nice :)

Problem 1: UPDATE not working

one.sql

INSERT INTO tblBusiness VALUES
  ('Michael's Hire and repair Shop','12 Tui St.', 'Napier',
   '(06) 123-4567','(021) 123-4567', 'info@mhirerepair.co.nz');

This causes a MySQL Error...

Solution
The problem here is that you have an extra quote after Michael effectively terminating the business description string. You can add a \ in front of the quote to "escape" it. Strings INSERT INTO tblBusiness VALUES ('Michael\'s Hire and repair Shop','12 Tui St.', 'Napier', '(06) 123-4567','(021) 123-4567', 'info@mhirerepair.co.nz');

Problem 2: Code looks ok, but MySQL flags errors

Problem: If your code throws errors and you have cut & pasted from another place it may have brought across special characters (like tab) that MySQL struggles with

Solution 1: Check that the filename & path are spelt correctly!

Solution 2: You may need to retype the code. Note: You may find clues if you look at the actual code when pasted into MySQL.

Solution 3: Check ";" are correct or "," in create statements.

Solution 4: If in Select check the order of conditions

Solution 6: Check that you have not used Create Database dbDatabaseCruise i.e. is "database" necessary.

Solution 7: It maybe compressing tabs (you can see it if things that should be separate are joined when displayed in mySQL e.g. tradeNamevarchar(40). In Notepad++ open the file, on the menu choose Edit > Blank Operations > TAB to Space.

Problem 3: SOURCE

If SOURCE h://prog1.sql gives an error 2 (not found) try moving to drive C

e.g. SOURCE c://prog1.sql

Seems that Windows has some file protections.

Problem 4: CSV Files

CSV or comma delimited files can be used to add data to a table. For example you can create a spreadsheet and put all the data in. You then export to a ".csv" file.

For importing a file you may need to use

lines terminated by '\r\n'\

As this is the way windows saves text files.

Ref: https://stackoverflow.com/questions/22622842/replace-n-r-in-mysql-database

References

virtualMV  |  Superquick wiki guide  |  Please give me some feedback

VirtualMV/MySQL/Interactive Help Desk. (2024). In WikiEducator/VirtualMV wiki. Retrieved November 23, 2024, from http:https://wikieducator.org/VirtualMV/MySQL/Interactive_Help_Desk    (zotero)