How to update a column to null in mysql

If a row already has null, and just use the first two lines of your show code, it will run just as fast, probably faster. Rows that already have null, simply won't be written back to DB, because there is no change.

Remember to look if your column can be null. Thiago Mata Thiago Mata 2, 30 30 silver badges 27 27 bronze badges. Phiter Daniel Dunn Daniel Dunn 77 8 8 bronze badges. After reading your answer, I ran the query and it executed as intended. James Donnelly k 33 33 gold badges silver badges bronze badges. Cyber Gangster Cyber Gangster 11 1 1 bronze badge. Steven Spielberg Steven Spielberg. Balasaheb Bhise Balasaheb Bhise 1 1 silver badge 7 7 bronze badges.

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The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. It allows you to change the values in one or more columns of a single row or multiple rows. Sometimes, you may want to update just one row; However, you may forget the WHERE clause and accidentally update all rows of the table. See the following employees table from the sample database.

In this example, we will update the email of Mary Patterson to the new email mary. Second, update the email address of Mary to the new email mary. Let me look one more time.

Yes, it is in fact null. I can see the NULL produced by my frnt end software in the data that should be null. General Failure 2, 3 3 gold badges 18 18 silver badges 45 45 bronze badges.

You don't need the "where If a row already has null, and just use the first two lines of your show code, it will run just as fast, probably faster. Rows that already have null, simply won't be written back to DB, because there is no change. Remember to look if your column can be null. Thiago Mata Thiago Mata 2, 30 30 silver badges 27 27 bronze badges. Phiter Daniel Dunn Daniel Dunn 77 8 8 bronze badges.

After reading your answer, I ran the query and it executed as intended. James Donnelly k 33 33 gold badges silver badges bronze badges. Cyber Gangster Cyber Gangster 11 1 1 bronze badge. Steven Spielberg Steven Spielberg. Balasaheb Bhise Balasaheb Bhise 1 1 silver badge 7 7 bronze badges.

Dylan Dylan 1. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.