SQL statements for Agent and Property demo

More MySQL commands example from a Well House Consultants training course
More on More MySQL commands [link]

This example is described in the following article(s):
• MySQL - JOIN or WHERE to link tables correctly? - [link]

Source code: agents Module: S157

# 1 Alder King 63, Fore Street Trowbridge 01225 754301
# 2 Connells Trowbridge 01225 754391
# 3 DK Residential 9 Church Street Trowbridge 01225 759123
# 4 Jayson Kent 35 Market Place Melksham 01225 707798
# 5 Halifax Trowbridge 01225 752375
# 6 Halifax Melksham 01225 703773
# 7 Greg Pullen Devizes 01380 724040
# 8 Town and Country Estates 16 High Street Westbury 01373 824444
# 9 Davies and Davies Bradford on Avon 01225 867555
# 10 Kavanaghs 13 High Street Melksham 01225 706860
#
# 1 10 Semington 225000 Double fronted two story apartment
# 2 10 Melksham 195000 Attractive detached older style family home
# 3 10 Atworth 237500 Attractive four bedroom village home
# 4 8 Westbury 152000 Three bedroomed semi
# 5 8 Trowbridge 205000 Four bedroom detached in cul de sac
# 6 6 Melksham 229950 Four bedroomed semi in Aloeric school catchment
# 7 5 Trowbridge 335000 Detached family home with no onward chain
# 17 1 Trowbridge 96950 Well presented one bedroom flat
# 8 5 Hilperton 279950 Modern detached home
# 9 4 Melksham 149950 For all those non-gardeners
# 18 1 Trowbridge 220000 semidetached family home
# 10 4 Melksham 127500 Within a prestigious retirement complex
# 11 11 Melksham 465000 Semidetached Spa house on town outskirts
# 12 3 Semington 222000 A pleasing detached modern residence
# 13 3 Hilperton 465000 An individual detached quality home
# 14 2 Westbury 140000 Three bedroom semidetached house
# 15 2 Trowbridge 116000 Larger than average first floor flat
# 16 11 Melksham 275000 Grade II Georgian townhouse requiring modernisation

drop database if exists forsale;
create database forsale;
use forsale;
create table agents (
        agent text,
        street text,
        town text,
        phone text,
        aid int primary key not null auto_increment);
load data infile "/Users/grahamellis/dec05/agents.tab" into table agents ignore 1 lines (aid, agent, street, town, phone);
create table sales (
        agid int,
        locate text,
        asking int,
        brief text,
        sid int primary key not null auto_increment);
load data infile "/Users/grahamellis/dec05/homes.tab" into table sales ignore 1 lines (sid, agid, locate, asking, brief) ;

select * from agents;
select * from sales;

# Regular join - shows all MATCHING records
select agent, town, phone, aid, agid, sid, locate, asking
         from agents join sales on aid = agid;
select agent, town, phone, aid, agid, sid, locate, asking
         from agents, sales where aid = agid;

# Left join - ALSO show agents with no properties listed
select agent, town, phone, aid, agid, sid, locate, asking
         from agents left join sales on aid = agid;

# right join - ALSO show properties with no agents listed
select agent, town, phone, aid, agid, sid, locate, asking
         from agents right join sales on aid = agid;

# Left join and NULL - only show agents with no properties listed
select agent, town, phone, aid, agid, sid, locate, asking
         from agents left join sales on aid = agid where sid is NULL;

# right join and NULL - only show properties with no agents listed
select agent, town, phone, aid, agid, sid, locate, asking
         from agents right join sales on aid = agid where aid is NULL;

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