This chapter provides an overview of how to use SQL to perform simple operations. This tutorial is only intended to give you an introduction and is in no way a complete tutorial on SQL. Numerous books have been written on SQL, including [melt93] and [date97]. You should be aware that some LightDB language features are extensions to the standard.
In the examples that follow, we assume that you have created a
database named mydb
, as described in the previous
chapter, and have been able to start ltsql.
Examples in this manual can also be found in the
LightDB source distribution
in the directory src/tutorial/
. (Binary
distributions of LightDB might not
provide those files.) To use those
files, first change to that directory and run make:
$
cd
...
/src/tutorial$
make
This creates the scripts and compiles the C files containing user-defined functions and types. Then, to start the tutorial, do the following:
$
ltsql -s mydb
...
mydb=>
\i basics.sql
The \i
command reads in commands from the
specified file. ltsql
's -s
option puts you in
single step mode which pauses before sending each statement to the
server. The commands used in this section are in the file
basics.sql
.