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SQL - NOT NULL Constraint
By default, a column can hold NULL values.
The NOT NULL constraint enforces a column to NOT accept NULL values.
This enforces a field to always...
SQL - Date Functions
The following table lists the most important built-in date functions in MySQL:
FunctionDescription
NOW()Returns the current date and time
CURDATE()Returns...
SQL - Aggregate Functions
SQL aggregate functions return a single value, calculated from values in a column.
FunctionDescription
AVG()Returns the average value
COUNT()Returns...
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