I’m in charge of some applications that manage many TB of images. We’ve found that storing file paths in the database to be best. There are a couple of issues: database storage is usually more expensive than file system storage you can super-accelerate file system access with standard off the shelf products for example, many web servers … Read more
Foreign keys are almost always “Allow Duplicates,” which would make them unsuitable as Primary Keys. Instead, find a field that uniquely identifies each record in the table, or add a new field (either an auto-incrementing integer or a GUID) to act as the primary key. The only exception to this are tables with a one-to-one … Read more
45 Call your hosting company and either have them set up regular log backups or set the recovery model to simple. I’m sure you know what informs the choice, but I’ll be explicit anyway. Set the recovery model to full if you need the ability to restore to an arbitrary point in time. Either way … Read more
For those arriving at this question because of the question title (as I did), this solved my problem: This error can indicate that the table’s PRIMARY KEY is not set to AUTO-INCREMENT, (and your insert query did not specify an ID value). To resolve: Check that there is a PRIMARY KEY set on your table, and that the … Read more
When we refer to file-based databases we mean databases that we interact with/update directly (via an SQL abstraction offered by the JDBC driver) but in essence we just read/write to a file directly. Example would be SQLite No, CSV is a comma separated values file which allows data to be saved in a table structured … Read more
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I would like to execute a following query: What should be the correct syntax?
You should try Have a look at INSERT and SQL SERVER – Insert Data From One Table to Another Table – INSERT INTO SELECT – SELECT INTO TABLE
You’re trying to use a different shaped df to mask your df, this is wrong, additionally the way you’re passing the conditions is being used incorrectly. When you compare a column or series in a df with a scalar to produce a boolean mask you should pass just the condition, not use this successively. you … Read more
Maybe just Or using a Difference Union (The EXCEPT keyword in SQL Server, not sure about other RDBMS implementations)