arrays
Unwrap an array into rows in PostgreSQL
Use unnest. For example: CREATE OR REPLACE FUNCTION test( p_test text[] ) RETURNS void AS $BODY$ BEGIN SELECT id FROM unnest( p_test ) AS id; END; $BODY$ LANGUAGE plpgsql IMMUTABLE COST 1;
Why do array indices start at zero in C?
In C, the name of an array is essentially a pointer [but see the comments], a reference to a memory location, and so the expression array[n] refers to a memory location n elements away from the starting element. This means that the index is used as an offset. The first element of the array is … Read more
How to assign a std::vector using a C-style array?
Don’t forget that you can treat pointers as iterators: w_.assign(w, w + len);
jq: how to filter an array of objects based on values in an inner array?
Very close! In your select expression, you have to use a pipe (|) before contains. This filter produces the expected output. . – map(select(.Names[] | contains (“data”))) | .[] .Id The jq Cookbook has an example of the syntax. Filter objects based on the contents of a key E.g., I only want objects whose genre … Read more
How can I create a generic array in Java?
I have to ask a question in return: is your GenSet “checked” or “unchecked”? What does that mean? Checked: strong typing. GenSet knows explicitly what type of objects it contains (i.e. its constructor was explicitly called with a Class<E> argument, and methods will throw an exception when they are passed arguments that are not of … Read more