17 sept 2014 · Adv SQL - Window Functions, CTEs, LATERAL JSONB and SP-GIST Functions - Overview Function Basics Functions - By Example Query
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Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleAdvanced SQL and Functions
Stephen Frost
stephen.frost@crunchydatasolutions.comJoe Conway
joe.conway@credativ.comCrunchy Data Solutions, Inc.
credativ InternationalSeptember 17, 2014
Stephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesQueries
Syntax Overview[ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] * | expression [ [ AS ] output_name ] [, ...] [ FROM from_item [, ...] ] [ WHERE condition ] [ GROUP BY expression, ... ] [ HAVING condition [, ...] ] [ WINDOW window_name AS ( window_definition ) [, ...] ] [ { UNION | INTERSECT | EXCEPT } [ ALL | DISTINCT ] .. ] [ ORDER BY expression [ ASC | DESC | USING op ], ... ] [ LIMIT num ] [ OFFSET num ]Stephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesQueries
Syntax Overview- from item[ ONLY ] table_name [ * ] [ [ AS ] alias [ ( column_alias [, ...] ) ] ] [ LATERAL ] ( select ) [ AS ] alias [ ( column_alias [, ...] ) ] [ LATERAL ] function_name ( [ argument [, ...] ] ) [ AS ] alias [ ( column_alias [, ...] | column_definition [, ...] ) ] [ LATERAL ] function_name ( [ argument [, ...] ] )AS ( column_definition [, ...] )
with_query_name [ [ AS ] alias [ ( col_alias [, ...] ) ] ] from_item [ NATURAL ] join_type from_item [ ON join_condition | USING ( column [, ...] ) ] with_query_name [ ( column_name [, ...] ) ]AS ( select | values | insert | update | delete )
Stephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesQueries
Syntax Overview- VALUES, TABLELast, but not least, the most complicated ones of all. VALUES returns a table, after
evaluating all expressions:VALUES ( expression [, ...] ) [, ...]
TABLE is essentially SELECT * FROM, but shorter:
TABLE table_name
[ ORDER BY expression [ ASC | DESC | USING op ], ... ] [ LIMIT num ] [ OFFSET num ]Stephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesQueries
ExamplesVALUES (1), (2), (3);
TABLE author;
SELECT * FROM author;
SELECT name AS designation FROM publisher;
SELECT DISTINCT authorid FROM bookauthor;
SELECT DISTINCT ON (authorid) authorid, bookname
FROM bookauthor ORDER BY authorid, bookpublishdate;SELECT title FROM book
WHERE net_price < 10.00;
Stephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesQueries
ExamplesSELECT * FROM book
WHERE lower(title) LIKE '%sql%'
ORDER BY lastname ASC, firstname ASC;
SELECT book.title FROM bookauthor, author, book
WHERE author.lastname = 'Eisentraut'
AND bookauthor.author_id = author.id
AND book.id = bookauthor.book_id
ORDER BY book.title DESC;
SELECT author, sum(price) AS price_sum
FROM bookpricelist
GROUP BY author HAVING sum(price) > 20
ORDER BY author;
Stephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesJoin Types
cross join inner join outer join left right fullStephen Frost, Joe ConwayPostgres Open 2014
Adv. SQL - Basics
Adv. SQL - Window Functions, CTEs, LATERAL
JSONB and SP-GIST
Functions - Overview
Function Basics
Functions - By ExampleQuery Syntax
Simple Queries
JoinsSet Operations
SubqueriesCross Joins
Joins each row from the rst table with each row from the second tableSELECT * FROM tab1 CROSS JOIN tab2;
is equivalent toSELECT * FROM tab1, tab2;Limited practical uses- generally used in error. particularly when comma-joins