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Jan 31, 2022 · 2 min read · For a full overview of MongoDB and all my posts on it, check out my overview. If you have relational data in your MongoDB instance, you can perform an operation similar to a JOIN typically done in SQL queries. Consider the following data set: db.podc...
Join discussionJan 24, 2022 · 3 min read · For a full overview of MongoDB and all my posts on it, check out my overview. When it comes to reading data out of your MongoDB instance you have two options, a query using the standard query language or an aggregation pipeline. While you can often u...
Join discussionOct 23, 2021 · 1 min read · In Bash scripts, any command following a && will only execute if the previous conditional or command succeeded (returned 0) The following script will only print out the variable if the conditional succeeds: [[ -z "$1" ]] && echo "$1" On the other han...
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Oct 22, 2021 · 1 min read · To check if a string is empty in a Bash script, use the -z conditional which returns 0 (true) if the length of the string is 0 and 1 (false) if it is greater than 0. myVar="hello" if [[ -z "$myVar" ]]; then echo "myVar is empty" else echo "m...
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Oct 20, 2021 · 2 min read · For a full overview of MongoDB and all my posts on it, check out my overview. MongoDB provides a filter positional operator $[<name_of_filter>] to only update some elements in an array. If you want to update all the elements in the array, use the al...
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