Essential Books

Selecting with null

suggest change 
SELECT Name FROM Customers WHERE PhoneNumber IS NULL

Selection with nulls take a different syntax. Don’t use =, use IS NULL or IS NOT NULL instead.

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SELECT:
* SELECT
* Using the wildcard character to select all columns in a query.
* SELECT Using Column Aliases
* Select Individual Columns
* Selecting specified number of records
* Selecting with Condition
* Selecting with CASE
* Select columns which are named after reserved keywords
* Selecting with table alias
* Selecting with more than 1 condition.
* Selecting with Aggregate functions
* Get aggregated result for row groups
* Selection with sorted Results
* Selecting without Locking the table
* Select with condition of multiple values from column
* Select distinct unique values only
* Selecting with null
* Select rows from multiple tables
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