Download Structured query language

Structured query language
This is a presentation by JOSEPH ESTRada on the beauty of
Structured Query Language
So, what is SQL you ask?
Language designed for the retrieval and management of data.
Standard Data Manipulation Language(DML).
Data definition language(DDL). Defines structure of the
database.
MYSql language structure
Literal values (Strings, numbers, hexadecimal values, boolean
values, bit-field values, null values)
database, table, index, column, and alias names
reserved words
user-defined variables
comments
literal values
string: character sequence in single or double quotes. optional
“collate” clause used to specify collation.
numbers: sequence of digits.
hexadecimal values: Act as binary strings or 64-bit precision
integers.
Boolean values: booleans.
bit-field values
null values
mysql language structure cont...
Identifiers: DB, table, index, column, and alias names.
reserved words: SELECT, UPDATE, DELETE, etc... (pg 570)
user-defined variables: SET @varr=value. allows shared data
between statements.
comments: #, --, /* */
Data Definition statements
ALTER DATABASE: change characteristics of db.
ALTER TABLE: change table structure/schema.
CREATE DATABASE: creates new db.
CREATE TABLE: creates new table.
DROP DATABASE: removes a dB.
DROP TABLE: removes a table.
RENAME TABLE: changes table name.
Data manipulation statements (not
complete)
DELETe: deletes tuples
insert: Insert tuples into a given table
select: Relational projection operator
update: Updates attribute/s
Aggregate functions
avg(column): AVg of a column
COUnt(column): number of rows w/o null value
MAX(column): highest value of a column.
MIN(column): Lowest value of a column.
SUM(column): Total sum of a column.
Create TABLE (DDL)
INSERT INTO Course (DML)
group by
Number of classes taught per instructor with GROUP by clause.
predicate
Classes under CS department with units 3 or greater.
count
Amount of courses taught by each department.
delete (DML)
delete all tuples.
DROP TABLE (DDL)
delete the table from the db.
EXIT(0)