While comments are helpful, over-commenting can make the code harder to read and maintain. Try to focus on explaining the high-level purpose and any non-obvious aspects of the code. Let’s take a look at a bad example: Comment in an SQL query. Image by Author. ...
In this method, we first write out the query then we add a separator i.e. “\\”, and then we will write the comment using - -. The query and the comment are separated by the separator. The comment in this case is not printed as an output of executing the query. Let’s implemen...
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How to write a sql query to remove non-printable characters in a column but keeping the carriage return? How to write a trigger to update uniqueidentifier field? How to write EXEC in select statement How to write If-Else Condition inside cursor How to write query to access multiple databases...
Example-1: Set column value to another table column value Write SQL query to update value of doctor charges in the doctor table by retrieving it from bill table UPDATE doctor SET doctor_charges = bill.doctor_charge FROM doctor LEFT OUTER JOIN bill ON bill.doctor_id = doctor.doctor_id ...
That’s why this SQL tutorial will provide you with a small peek at some steps that you can go through to evaluate your query: First off, you’ll start with a short overview of the importance of learning SQL for jobs in data science; Next, you’ll first learn more about how SQL proc...
Download Now: Introduction to Data Analytics [Free Guide] If your company already stores data in a database, you may need to learn SQL to access the data. But don‘t worry — you’re in the right place to start. Let's jump right in. How to Query a SQL Database Ensure you have ...
By testing these parts you’ll get the idea of what is happening in the background, and could assume what the final result should be. But still, we have to answer on “How to write a complex SELECT query?”. How to Write a Complex SELECT Query – Write Parts of the Query at the...
I am trying to write a SQL statement to find related videos in a video site for a particular video. The TAG terms under a video goes as a query to this SQL statement to find related videos. Following SQL statement returns only the same video (single video) that has the exact tags. ...
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