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Strange query results

Elias Alhanatis
P: 56
I have a table with a column called "Lesson_Names",varchar type.
The following query :
"SELECT Lesson_Id FROM Lesson_Names WHERE Lesson_Name='LATIN_2A' "
returns 2 IDs instead of 1 ( the IDs of "LATIN_2A" and of "LATIN_2B" ) .
Is there something i am doing wrong?

Thank you in advance ,

Sep 18 '11 #1
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5 Replies

Expert Mod 100+
P: 2,324
The only thing i can think of is maybe the underscore is being interpreted as a wildcard. But that's only supposed to happen when you use LIKE.

Just incase, try using "Lesson_Name='LATIN\_2A'"

If that doesn't work, there's probably something up with your data. The rest of your query looks good.
Sep 27 '11 #2

Expert 100+
P: 931
I'm replying to this just because I would like to know what the answer is in case you do indeed find the answer! The query looks good to me as well...

Sep 28 '11 #3

Expert Mod 10K+
P: 12,347
Run this and post the results here
Expand|Select|Wrap|Line Numbers
  1. SELECT Lesson_Id, Lesson_Name
  2. FROM Lesson_Names
  3. WHERE Lesson_Name='LATIN_2A'
Sep 28 '11 #4

Elias Alhanatis
P: 56
I managed to bypass the error using "LATIN_TWO_A" and "LATIN_TWO_B",
but it still appears when using greek letters:

SELECT Lesson_Id, Lesson_Name
FROM Lesson_Names
WHERE Lesson_Name='ΛΑΤΙΝ_2Α'

154 ΛΑΤΙΝ_2Α
155 ΛΑΤΙΝ_2Β

Indeed the underscore is some kind of wildcard , but
the results it yelds are not clear...
Sep 29 '11 #5

Expert 100+
P: 931
I'm not sure if it helps, but it does appear that "_" is indeed a wildcard in MySQL:
Sep 30 '11 #6

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