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Fast way to discover the row count of a table in PostgreSQL
I need to know the number of rows in a table to calculate a percentage. If the total count is greater than some predefined constant, I will use the constant value. Otherwise, I will use the actual number of rows.
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How many levels of pointers can we have?
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How does the String class override the + operator?
...y in Java you're able to add Strings with the + operator, when String is a class? In the String.java code I did not find any implementation for this operator. Does this concept violate object orientation?
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What is this weird colon-member (“ : ”) syntax in the constructor?
Recently I've seen an example like the following:
12 Answers
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String difference in Bash
I'm trying to find a way to determine the difference between two strings in my script. I could easily do this with diff or comm, but I'm not dealing with files and I'd prefer not to output them to files, do the compare and read it back.
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Converting ISO 8601-compliant String to java.util.Date
I am trying to convert an ISO 8601 formatted String to a java.util.Date .
29 Answers
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Add only non-whitespace changes
I have my text editor to automatically trim trailing whitespace upon saving a file, and I am contributing to an open source project that has severe problems with trailing whitespace.
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converting a base 64 string to an image and saving it
Here is my code:
9 Answers
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Difference between const & const volatile
If we declare a variable as volatile every time the fresh value is updated
If we declare a variable as const then the value of that variable will not be changed
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