Category: 03. SQL Select
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SELECT DISTINCT
The SQL DISTINCT command is used with SELECT key word to retrieve only distinct or unique data. In a table, there may be a chance to exist a duplicate value and sometimes we want to retrieve only unique values. In such scenarios, SQL SELECT DISTINCT statement is used. Note: SQL SELECT UNIQUE and SQL SELECT DISTINCT statements…
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SELECT UNIQUE
Actually, there is no difference between DISTINCT and UNIQUE. SELECT UNIQUE is an old syntax which was used in oracle description but later ANSI standard defines DISTINCT as the official keyword. After that oracle also added DISTINCT but did not withdraw the service of UNIQUE keyword for the sake of backward compatibility. In simple words, we…
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SELECT Statement
The SELECT statement is the most commonly used command in Structured Query Language. It is used to access the records from one or more database tables and views. It also retrieves the selected data that follow the conditions we want. By using this command, we can also access the particular record from the particular column…