What is the use of WHERE clause in SQL?

The SQL WHERE Clause The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition.

Which query will return all the rows and columns from the table?

Answer: SELECT query is used to retrieve data from a table.

How can we select the entire content of a table using select statement?

To select all columns of the EMPLOYEES Table:

1. Click the icon SQL Worksheet. The SQL Worksheet pane appears.
2. In the field under “Enter SQL Statement:”, enter this query: SELECT * FROM EMPLOYEES;
3. Click the Execute Statement. The query runs.
4. Click the tab Results. The Results pane appears, showing the result of the query.

What is SELECT clause in SQL?

The SELECT clause specifies the columns from which data values are to be retrieved by the query. Data retrieval is limited to the columns specified. When selecting from two or more tables having duplicate column names, it may be necessary to qualify column names with table or view names.

What is WHERE clause in database?

A WHERE clause in SQL specifies that a SQL Data Manipulation Language (DML) statement should only affect rows that meet specified criteria. In brief SQL WHERE clause is used to extract only those results from a SQL statement, such as: SELECT , INSERT , UPDATE , or DELETE statement.

Which clause allows us to select those rows?

Discussion Forum

Which clause is mandatory with clause SELECT in mysql?

Explanation: “SELECT” clause is used to show all rows and columns that are mention with the query. 5. Can “SELECT” clause be used without the clause “FROM”?

What is the order of SELECT statement clauses?

The ORDER BY clause sorts the result-set in ascending or descending order. It sorts the records in ascending order by default. DESC keyword is used to sort the records in descending order.

WHERE is the group by clause placed in the SELECT statement?

GROUP BY clause is used with the SELECT statement. In the query, GROUP BY clause is placed after the WHERE clause.

How to use SQL where clause in a statement?

The SQL WHERE clause with SELECT statement retreives records form a table against some given conditions. The basic form of the SELECT statement is SELECT-FROM-WHERE block. In a SELECT statement, WHERE clause is optional. Using SELECT without a WHERE clause is useful for browsing data from tables.

What is the syntax of the where clause in the SELECT statement?

The following illustrates the syntax of the WHERE clause in the SELECT statement: SELECT column1, column2, FROM table WHERE condition; The WHERE clause appears immediately after the FROM clause. The WHERE clause contains one or more logical expressions that evaluate each row in the table.

What is the structure of the while loop in SQL?

The following flowchart explains the essential structure of the WHILE loop in SQL: As you can see, in each iteration of the loop, the defined condition is checked, and then, according to the result of the condition, the code flow is determined. If the result of the condition is true, the SQL statement will be executed.

How do you select specific rows from a table in SQL?

To select certain rows from a table, you use a WHERE clause in the SELECT statement. The following illustrates the syntax of the WHERE clause in the SELECT statement: SELECT column1, column2, FROM table WHERE condition; The WHERE clause appears immediately after the FROM clause.