The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values.
Which of the following is used to return only different values?
The correct answer is option D (Select distinct). Select distinct statement is used to return only different values that match the specified criteria. The following is the syntax to use select distinct statement: Select DISTINCT column_1, column_2,……
What is the return type of SELECT statement in SQL?
The SQL SELECT statement returns a result set of records, from one or more tables. A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command.
What is difference between unique and distinct?
The main difference between unique and distinct is that UNIQUE is a constraint that is used on the input of data and ensures data integrity. While DISTINCT keyword is used when we want to query our results or in other words, output the data.
Can we use distinct in where clause?
WHERE conditions: The conditions may meet for the records which are selected and it is optional. Note: When one expression is provided in the DISTINCT clause then the query will return the unique values of the expressions.
Which keyboard is used to return only different values in a column?
Explanation: The SELECT DISTINCT statement is used to return only distinct (different) values.
What are the 3 types of SELECT query?
Luckily for us, Microsoft Access allows for many types of queries, some of the main ones being select, action, parameter and aggregate queries. They can be thought of as just another part of your database – essentially an object like a table or a macro.
What is difference between delete and drop commands?
DROP is a Data Definition Language (DDL) command which removes the named elements of the schema like relations, domains or constraints and you can also remove an entire schema using DROP command.
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Comparison Chart:
| Parameter | DELETE | DROP |
|---|---|---|
| Language | Data Manipulation Language command | Data Definition Language command. |
How do I SELECT specific rows in SQL?
To select rows using selection symbols for character or graphic data, use the LIKE keyword in a WHERE clause, and the underscore and percent sign as selection symbols. You can create multiple row conditions, and use the AND, OR, or IN keywords to connect the conditions.