In SQL, the INSERT INTO SELECT statement is used to copy records from one table to another existing table. In this tutorial, you will learn about the SQL INSERT INTO SELECT statement with the help of examples.
The SQL CASE statement is used to check conditions and perform tasks on each row while selecting data. In this tutorial, you will learn about the SQL CASE statement with the help of examples.
“If tomorrow is a holiday, I’ll plan for a vacation”, “If the train fare is not more than 500, I’ll go home. In the above examples, activity depends on the outcome of something. So, there is a condition that has to be tested; if the condition...
The EXCEPT statement was introduced in Microsoft SQL Server 2005. In this article, you will learn how to use SQL EXCEPT with the help of some simple examples. The conditions to execute SQL EXCEPT statement There are a couple of conditions that have to be met before you can use the EXCEPT...
Basic SELECT statement, changing the field name SELECT FirstName as ‘First Name’, LastName as ‘Last Name’ FROM Customers Basic SELECT statement, concatenating and formatting columns SELECT FirstName + ‘‘ + LastName as ‘Customer Name’ From Customers ...
In SQL, a stored procedure is a set of statement(s) that perform some defined actions. In this tutorial, you will learn about stored procedures in SQL with the help of examples.
SQL CREATE TABLE | SELECT Statement Examples For an example of creating a new SQL table from an existing one, suppose we want to extract a female patient table and store it in a new table calledfemale_patient. Two ways to write this SQL query: ...
Expressions in SQL with Examples In this article, we will learn about expressions in SQL and implement some examples to demonstrate Boolean, numeric, and date-time expressions. 1. Boolean Expressions The use of Boolean expressions is mainly done in the where clause of the SQL queries which can...
Hive是一个数据仓库基础的应用工具,在Hadoop中用来处理结构化数据,它架构在Hadoop之上,通过SQL来对数据进行操作,了解SQL的人,学起来毫不费力。 Hive 查询操作过程严格遵守HadoopMapReduce的作业执行模型,Hive 将用户的Hive SQL 语句通过解释器转换为MapReduce 作业提交到Hadoop 集群上,Hadoop 监控作业执行过程,然后返回作...
Understanding SQL CROSS JOIN (Practical Examples Included) CROSS JOIN Introduction What is a CROSS JOIN in SQL? In SQL, CROSS JOINs are used to combine each row of one table with each row of another table, and return the Cartesian product of the sets of rows from the tables that are ...