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mysql - Error Code: 1062. Duplicate entry '1' for key 'PRIMARY'

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In my application I have Lecturers and they have list of Courses they can teach and when I'm deleting a course I ... . What am I doing wrong? See Question&Answers more detail:os...

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javascript - Blur Img's & Div's in HTML using CSS

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python - Pyspark replace strings in Spark dataframe column

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javascript - CORS cookie credentials from mobile WebView loaded locally with file://

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r - Euclidean distance of two vectors

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java - Manually call Spring Annotation Validation

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sql - formula for computed column based on different table's column

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javascript - CORS not working on Chrome

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android - DialogFragment with clear background (not dimmed)

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java - Bufferedimage resize

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apache spark - How to split a list to multiple columns in Pyspark?

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c++ - How to read / write a struct in Binary Files?

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c - Sizeof vs Strlen

#include <stdio.h> #include <string.h> int main(int argc, char *argv[]) { char string[] = "october"; ... something wrong with my syntax or what? See Question&Answers more detail:os...

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c# - How to run something in the STA thread?

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python - Pandas: Difference between largest and smallest value within group

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php - .htaccess 301 redirect of single page

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java - How do I use modulus for float/double?

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python - Spark DataFrame TimestampType - how to get Year, Month, Day values from field?

I have Spark DataFrame with take(5) top rows as follows: [Row(date=datetime.datetime(1984, 1, 1, 0, 0), ... Day values from the 'date' field? See Question&Answers more detail:os...

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Android 4.0: widgets not appearing?

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javascript - How do I pass along variables with XMLHTTPRequest

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How much memory does a string use in Java 8?

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