Example #4 – Selecting the Number of Records Query: SELECTCOUN(*)ascountfromStudent; Output: Query: SELECTCOUN(*)ascountfromClass; Output: Other Facts about the SQL SELECT The select statement mentioned above can be performed on the relational database. There are various other select statement...
In SQL, in order to EXCLUDE certain rows from being returned by a SELECT query, we use some restricting or excluding conditions based on some criteria. EXCLUDE conditions in SQL usually appear in the WHERE clause of the statement or in the HAVING clause of an aggregate query. Some commonly ...
Example: UPDATE Intellipaat AS i1 JOIN Intellipaat AS i2 ON i1.department = i2.department SET i1.salary = i2.salary * 1.05 WHERE i1.status = 'Active' AND i2.role = 'Manager'; Select * from Intellipaat; Output: Explanation: Here, this query raises all current employees’ salaries...
For the remainder of the tip, example T-SQL queries are run onthe AdventureWorks2017 sample database. At every section, the syntax is given, so you can modify it to suit your queries or you can copy paste the query and change any column or table name. The Searched CASE Expression The ...
A query without a FROM clause can be used to return a single row of data containing a constant or expression. For example, to select the current day of the week: Tableless Query Example 1 SELECT DAYNAME(NOW()) AS "Today" Note A tableless query will create a result set backed by a...
Astatement(语句)is a combination(组合)of two or more clauses(Select语句是两个或者多个子句的组合) ——for example,SELECT * FROM employees(SELECT *叫一个子句,FROM employees叫一个子句) 注意:习惯将关键字写成大写 Selecting All Columns: SELECT* ...
CASE Statement with UPDATEWe can use CASE statement within the UPDATE statement to perform conditional updates on data in a table.ExampleIn the following query we are updating the salary of all the customers based on their age.If the age of the customer is equal to '25', their salary will...
Syntax: DESC[RIBE][SCHEMA].object name For example, will display the EMPLOYEE table structure i.e. columns, their data types, precision and nullable property. Print Page Previous Next Advertisements
One way to query multiple tables is to write a SELECT statement with multiple table names seperated by a comma. This is also known as a "cross join". When querying more than one table, column names need to be specified by table_name.column_name. ...
Example 3-2 Using the SQL SELECT Statement to Query Data From Specific Columns -- the following retrieves data in the employee_id, last_name, first_name columnsSELECTemployee_id, last_name, first_name FROM employees; -- the following retrieves data in the department_id and department_name ...