To remove all the records from a table, use the DELETE statement and specify which table or tables from which you want to delete all the records.
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Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. If you're a data engineer, a database administrator, or even just your average data fanboy or girl, one day you're going to find yourself with a database that becomes your "baby. Yes, we're still talking about databases! It has everything you need to make DML statements child's play. We'll use a sample database to demonstrate each of the three.
Keeping with the baby theme, let's say you're the data administrator at a children's hospital, "Mickey Mouse Children's Hospital," to be precise. The hospital keeps records of all its little patients, including their age, weight, blood test results—you get the adorable picture. Usually, the doctors enter and update this information into the hospital's system each time they see their patients, and much of the inserting, updating, and deleting of records into the database is performed by the system.
But often there are things that need manual fixing, and as the resident database administrator, this is your time to shine! In the article below, we use three different tables to demonstrate the three different statements. Sample table number two carries the different departments of the hospital and the groups and categories those departments fall under:.
Just like babies, there's new data born every minute. With lots of savvy systems in place, often that data is added seamlessly to its intended databases. First, we need to identify the table we're wanting to insert rows into. Next, we specify the columns we want to fill. Finally, we stipulate the values we need to add. One of the doctors at Mickey Mouse Children's Hospital has a newborn patient who has not yet been named. The doctor needs to enter the baby into the database immediately in order to access a drug trial for the sick child, but the system won't allow the littlun's file to be submitted without a name.
The doctor wants the patient to be added using her patient number, with her name left blank until a later date. As the administrator, you'll need to enter the patient manually into the database.
As you can see, we're not only giving the name of the table we need to insert into but also the names of the columns and values we want to add. We don't specify the PatientID in the column list because as an identity column, this is automatically populated. Because we want to keep the patient's name blank for now, we write NULL for the name columns.
To insert more than one row of data with just one statement, use parentheses and commas to specify the distinct new rows. Related Posts. Leave a Comment Cancel Reply Your email address will not be published. Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site.
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