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SQL tutorial
SQL – in simple words, it is a programming language for structured queries (Structured Query Language), which is used as an effective way to save data, find its parts, update, extract from the database and delete.
Types of SQL queries
SELECT – Extract records from the table
SELECT LIMIT – Extract records from the table and limit the results.
SELECT TOP – Extract records from a table and limit the results.
INSERT – Insert records into a table
UPDATE – Update table entries
DELETE – Delete entries from the table.
TRUNCATE TABLE – Delete all records from the table (without rollback).
UNION – Combines 2 sets of results (removes duplicates)
UNION ALL – Combines 2 sets of results (includes duplicates)
INTERSECT – Crossing 2 sets of results
MINUS – Resulting set of one minus resultant set of another
EXCEPT – set of results one minus set of results another
JOIN – Connection of tables
DISTINCT – Get unique records
FROM – Table list and JOIN information
WHERE – Results Filter
ORDER BY – Sort request results
GROUP BY – Group one or more columns
HAVING – Restrict groups of returned rows
SQL tables and views
CREATE TABLE – Create a table
CREATE TABLE AS – Create a table from the definition and data of another table
ALTER TABLE – Add, modify or delete columns in the table; rename the table
DROP TABLE – Delete table
GLOBAL TEMP – Tables tables that are different within an SQL session
LOCAL TEMP – Tables Tables that differ in modules and SQL built-in program
SQL VIEW – Virtual tables (views of other tables)
SQL keys, indexes
Primary Keys – Create or delete primary keys.
Indexes – Creating and deleting indexes (performance tuning)
SQL Comparison Operators
Comparison operators – Comparison operators such as =, !=, <>, >, >=, <, <= etc.
SQL conditions
AND – 2 or more conditions to be met
OR – Any of the conditions are fulfilled
AND and OR – Combination of conditions AND and OR
LIKE – Use wildcards in the WHERE sentence.
IN – Matching the expression to the list of values
NOT – Denial
IS NULL – Check value to NULL
IS NOT NULL – Check value for NOT NULL
BETWEEN – Selection within range (inclusive)
EXISTS – The condition is fulfilled if the subquery returns at least one line
SQL programming
Comments – How to create comments in your SQL code
SQL data types
Data Types – Data types in SQL
SQL Aliases
ALIASES – Create a temporary name for a column or table
SQL Functions
COUNT – Returns the number of expressions
SUM – Returns the amount of the expression
MIN – Returns minimum expression
MAX – Returns maximum expression
AVG – Returns the average value of the expression
SQL literalsLITERALS – Literals such as string, integer, decimal and datetime. |
SQL Tutorial – Full Database Course for Beginners
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