Beginning SQL by Paul Wilton PDF
By Paul Wilton
SQL works with databases to insert and extract info and is a world normal for manipulating info in databases. This hands-on source covers every little thing from a evaluate of SQL fundamentals and database layout to making your individual databases and utilizing the SQL language in quite a few database purposes. full of crucial code, theories, options, and strategies, in addition to a cache of worthwhile examples, this accomplished textual content can have you quick designing your individual databases and writing SQL code enough for plenty of real-world events. perform workouts in each one bankruptcy aid accelerate your comprehension.
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Now that the brief introduction to data types is over with, you can move on to something a bit more interesting and hands-on — creating tables! Creating, Altering, and Deleting Tables This section discusses the basics of creating a table using SQL. It shows you how to create a new table, how to modify existing tables, and finally, how to delete tables that you no longer need. After that, using what you’ve learned, you create the tables for the book’s example database. Creating a Table To create a table, use SQL’s CREATE TABLE statement.
Creating, Altering, and Deleting Tables This section discusses the basics of creating a table using SQL. It shows you how to create a new table, how to modify existing tables, and finally, how to delete tables that you no longer need. After that, using what you’ve learned, you create the tables for the book’s example database. Creating a Table To create a table, use SQL’s CREATE TABLE statement. Creating a basic table involves naming the table and defining its columns and each column’s data type.
The following is the basic syntax for creating a table: CREATE TABLE name_of_table ( name_of_column column_datatype ) CREATE TABLE is the keyword telling the database system what you want to do — in this case, you want to create a new table. The unique name or identifier for the table follows the CREATE TABLE statement. Then in brackets comes the list defining each column in the table and what sort of data type it is. The syntax becomes clearer with an example. info Chapter 1 The following SQL creates a table based on the earlier train timetable example: CREATE TABLE Train_Times ( start_location varchar(75), destination varchar(75), departs time, arrives time ); MS SQL Server doesn’t have the time data type, so you need to change the data type to datetime.
Beginning SQL by Paul Wilton