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Fast way to discover the row count of a table in PostgreSQL
... and counts rows in it. A bigger sample increases the cost and reduces the error, your pick. Accuracy depends on more factors:
Distribution of row size. If a given block happens to hold wider than usual rows, the count is lower than usual etc.
Dead tuples or a FILLFACTOR occupy space per block. If...
Mac OS X - EnvironmentError: mysql_config not found
...on 3)
If you did all those steps in the same order, and you still got an error, read on to the end, if, however, you did not follow these exact steps try, following them from the very beginning.
So, you followed the steps, and you're still geting an error, well, there are a few things you could t...
Any reason to clean up unused imports in Java, other than reducing clutter?
...eferenced by the import from the classpath, you won't get a silly compiler error that served no purpose. And you won't get false positives when you perform a "where used" search.
Another (but this would be very specific in nature) would be if the unused import had naming conflicts with another impo...
How to use conditional breakpoint in Eclipse?
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Don't forget to OMIT the ; at the end - I got an error when I included it.
– modulitos
Sep 23 '14 at 4:12
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close vs shutdown socket?
... very bad. If you just shutdown, subsequent use of the FILE will just give errors until fclose is called.
– R.. GitHub STOP HELPING ICE
Nov 12 '10 at 4:22
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How does the String class override the + operator?
... is convertible (§5.1.8)to a primitive numeric type, or a compile-time error occurs.
In every case, the type of each of the operands of the binary - operator must be
a type that is convertible (§5.1.8) to a primitive numeric type, or a
compile-time error occurs.
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What's a concise way to check that environment variables are set in a Unix shell script?
...xpansion. For example, the bash manual says:
${parameter:?word}
Display Error if Null or Unset. If parameter is null or unset, the expansion of word (or a message to that effect if word is not present) is written to the standard error and the shell, if it is not interactive, exits. Otherwise, t...
How can I modify the size of column in a MySQL table?
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@WarrenSergent, tested in 5.7.15, it will throw an error if there are values affected by the change. It will not truncate by default. You will have to update the values beforehand with a SUBSTR.
– Robert T.
Nov 4 '16 at 13:36
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In PHP, what is a closure and why does it use the “use” identifier?
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The as keyword in the use statement is giving me a syntax error in php 5.5: $closure = function ($value) use ($localVar as $alias) { //stuff}; Error given is: Parse: syntax error, unexpected 'as' (T_AS), expecting ',' or ')'
– Kal Zekdor
Jul 29...
How to start working with GTest and CMake
...s between your test binary and the Google Test library is to blame on such errors. That's why it's recommended to bring in Google Test in the source form and build it along with your tests. It's very easy to do in CMake. You just invoke ADD_SUBDIRECTORY with the path to the gtest root and then you ...