SQL is a domain-specific language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system.
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Chapters
Getting started with SQL
Identifier
Data Types
NULL
Example Databases and Tables
SELECT
GROUP BY
ORDER BY
AND & OR Operators
CASE
LIKE operator
IN clause
Filter results using WHERE and HAVING
SKIP TAKE (Pagination)
EXCEPT
EXPLAIN and DESCRIBE
EXISTS CLAUSE
JOIN
UPDATE
CREATE Database
CREATE TABLE
CREATE FUNCTION
TRY/CATCH
UNION / UNION ALL
ALTER TABLE
INSERT
MERGE
cross apply, outer apply
DELETE
TRUNCATE
DROP Table
DROP or DELETE Database
Cascading Delete
GRANT and REVOKE
XML
Primary Keys
Indexes
Row number
SQL Group By vs Distinct
Finding Duplicates on a Column Subset with Detail
String Functions
Functions (Aggregate)
Functions (Scalar/Single Row)
Functions (Analytic)
Window Functions
Common Table Expressions
Views
Materialized Views
Comments
Foreign Keys
Sequence
Subqueries
Execution blocks
Stored Procedures
Triggers
Transactions
Table Design
Synonyms
Information Schema
Order of Execution
Clean Code in SQL
SQL Injection
Source: goalkicker.com