Here you will find everything to get started with SQL and then learn the advance concepts of SQL.
By using ALTER command we can add, edit or modify table, views and databases.
The following table lists the values for Field Type and whether you can specify n Field Width and n Precision: The n Field Width and n Precision parameters are ignored for the Blob, Currency, Date, Date Time, General, Integer, Logical, and Memo field types.
If n Precision is not included for the Numeric or Float types, the n Precision parameter defaults to zero (no decimal places). Next Value specifies the start value and can be a positive or a negative value ranging from Integer range: -2,147,483,647 to 2,147,483,647. Step Value specifies the increment value for the field and can be a positive, nonzero integer value ranging from 1 to 255. When you change a table that does not contain an autoincrementing field to include one, either by using ALTER TABLE SQL clause or the File Structure dialog box, autoincrementing begins with the next record will be added.
SQL Tutorials: Collection of SQL tutorials for beginners and advance programmers.
We have developed many tutorials and examples on SQL.
In this tutorial you will learn how to you user SQL to interact with database.
We have used My SQL database to make the process simple.
The COLUMN word is not obligatory, but can be used.
Maximal field count a DBF table can contain is 255 fields.
For this example we won't add any data to our tables as it wouldn't have any effect on the update process since we are going from case insensitive to case sensitive.
It's important to note that if you were performing the reverse update that is from case sensitive to case insensitive, you would also have an extra step of resolving any data issues as the update could result in duplicate data in columns with unique constraints.