In this tutorial, we’ll see how to add comments in SQL to make your code simpler and easier to read. The Quick Answer: How to Create Comments in SQL There are three ways to add comments to your SQL queries: Single-Line Comments:Single-line comments start with--double hyphens. ...
In order to bring the proper clarity and to make the code readable, comments are added to the code. Comments are added by the developer or the programmer of the code to make it understandable for everyone. We also usually use comments in the psql so that the queries and commands are more...
Another command that can print comments in the console is \WARN. It is similar to \ECHO; however, the output is printed to the standard error channel. This does not make a difference. It will work perfectly if you run the query with the \WARN command. \dt \warn display_table; Becaus...
In today's era of big data, SQL is not only used by data professionals but also by non-technical personnel in product and operations roles. Efficiently harnessing the power of SQL to leverage data becomes crucial. MaxCompute (ODPS)SQL has evolved to a mature stage. As an SQL dialect, it ...
In SQL Server we have a procedure called "" for adding comments to tables and columns. Following is the sample script: -- Adding a comment to a column Col1 for the table LangTest EXEC sys.sp_addextendedproperty@name=N'MS_Description',@value=N'hello col1' ,@level0type=N'SCHEMA',@lev...
7 rows in set (0.00 sec) Say you have to run this query on a regular basis. This could become tedious to have to write out the query repeatedly, especially when it comes to longer and more complex query statements Also, if you had to make slight tweaks to the query or expand on it...
On the first node only, aspostgresuser modify thepostgresql.conffile. The steps below are used for creating a replicated database instance for use with promotablepgsqlpacemaker resource: Below are the settings which should be included, and these can be appended to the bottom of the configuration...
The obvious answer is to look at the SQL Server query execution time, but that alone isn’t always enough to determine that there is or isn’t an improvement – or if that new index is helping. If the query was already finishing in a second or 2 that just isn’t enough precision to...
The more functionality a database has, the more vulnerable it is to a potential SQL injection attack. To keep it protected, considernormalizing your databaseto remove extraneous content and make your site safer. Step 6: Limit access privileges ...
references like these in any operation, but doing so is technically only necessary in operations where two columns from different tables share the same name. It’s good practice to use them when working with multiple tables, though, as they can help makeJOINoperations easier to read and ...