Here are some strategies to optimize SQL queries involving NULL values: 1. Proper Indexing: Indexes might not be used efficiently for columns with many NULL values. 2. Use IS NULL and IS NOT NULL ...
SQL Interview questions related to NULL. Here are ten common SQL interview questions related to NULL values, along with their answers, you can also check the video about the same in first comment. 1.
PRIMARY KEY , FOREIGN KEY , NOT NULL , DEFAULT , UNIQUE Primary Key A Primary Key is a column (or combination of columns) that uniquely identifies each record in a table. It does not allow duplicate ...
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