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Truncate all tables in a MySQL database in one command?
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27 Answers
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Simple Pivot Table to Count Unique Values
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Insert a 3rd column and in Cell C2 paste this formula
=IF(SUMPRODUCT(($A$2:$A2=A2)*($B$2:$B2=B2))>1,0,1)
and copy it down. Now create your pivot based on 1st and 3rd column. See snapshot
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How to calculate the sentence similarity using word2vec model of gensim with python
According to the Gensim Word2Vec , I can use the word2vec model in gensim package to calculate the similarity between 2 words.
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How to set a Header field on POST a form?
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edited Mar 1 '12 at 13:29
answered Mar 1 '12 at 13:20
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Cast Object to Generic Type for returning
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212
You have to use a Class instance because of the generic type erasure during compilation.
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How can I specify a branch/tag when adding a Git submodule?
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12 Answers
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Multiple Updates in MySQL
... DUPLICATE KEY UPDATE.
Using your example:
INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);
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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a , but the call pow(a,6) is not optimized and will actually call the library function pow , which greatly slows down the performance. (In contrast, Intel C++ Compiler , executable icc , will ...