Hacker Rank SQL

Select All Solution

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Task

Query all columns (attributes) for every row in theย CITYย table.

Theย CITYย table is described as follows:

Field Type
ID NUMBER
NAME VARCHAR2(17)
COUNTRYCODE VARCHAR2(3)
DISTRICT VARCHAR2(20)
POPULATION NUMBER

 

Solution โ€“ Select All

MySQL Code
SELECT * FROM CITY;

 


The SQL SELECT Statement

The SELECT statement is used to select data from a database.

The data returned is stored in a result table, called the result-set.

Define Select all ?

ALL is used to select all records of a SELECT STATEMENT. It compares a value to every value in a list or results from a query. The ALL must be preceded by the comparison operators and evaluates to TRUE if the query returns no rows. For example, ALL means greater than every value, means greater than the maximum value.

Difference between SELECT * and SELECT ALL?

SELECT ALL means ALL rows, i.e including duplicate rows. (The opposite is SELECT DISTINCT, where duplicate rows are removed.) ALL is the default, and most people write just SELECT instead of SELECT ALL.

SELECT * means all columns.

 

 

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