The SQL SELECT statement is used to select data from a SQL database table. This is usually the very first SQL command every SQL newbie learns and this is because the SELECT SQL statement is one of the most used SQL commands.
Please have a look at the general SQL SELECT syntax:
SELECT Column1, Column2, Column3,
FROM Table1
The list of column names after the SQL SELECT command determines which columns you want to be returned in your result set. If you want to select all columns from a database table, you can use the following SQL statement:
SELECT * FROM Table1;
When the list of columns following the SELECT SQL command is replaced with asterix (*) all table columns are returned. Word of caution here, it’s always better to explicitly specify the columns in the SELECT list, as this will improve your query performance significantly.
The table name following the SQL FROM keyword (in our case Table1) tells the SQL interpreter which table to use to retrieve the data.
Popular Posts
-
The SQL AVG aggregate function selects the average value for certain table column. Have a look at the SQL AVG syntax: SELECT AVG(Column1) FR...
-
Namespaces Namespaces allow to group entities like classes, objects and functions under a name. This way the global scope can be divided in ...
-
package interfaceexercise; // Define an interface with three abstract methods. // Any class that implements this interface has to // impleme...
-
The SQL MAX aggregate function allows us to select the highest (maximum) value for a certain column. The SQL MAX function syntax is very sim...
-
Please do this exercise at the command line instead of using NetBeans. This is to learn the concept of packaging without the help of NetBean...
-
Tutorials Chapter 1 : What is SQL Server? Chapter 2 : Compare SQL Server and MS Access Chapter 3 : What is MSDE ? Chapter 4 : SQL Server Edi...
-
SQL Server (and SQL Server Express) supports two authentication modes: 1. Windows Authentication mode 2. Mixed Mode (Windows Authentication ... -
JavaServer Pages (JSP) lets you separate the dynamic part of your pages from the static HTML. You simply write the regular HTML in the norma...
-
The SQL SELECT INTO statement is used to select data from a SQL database table and to insert it to a different table at the same time. The g...
-
4.2 The Framework Class Library Now that you have a taste of the goals and groundwork laid by the CLR and managed code, let’s taste ...
No comments:
Post a Comment