Your last query
mysql> select table_name from tables as a left join (select distinct table_name from tables as b) on a.table_name!=b.table_name;
ERROR 1248 (42000): Every derived table must have its own alias
fails because the as b
must be outside the parentheses like this
mysql> select table_name from tables as a left join (select distinct table_name from tables) as b on a.table_name!=b.table_name;
Your method 2 failed
mysql> select count(table_name) as num, table_name from tables group by table_name where num > 1;
because the group by table_name
must be last like this
mysql> select count(table_name) as num, table_name from tables where num > 1 group by table_name;
SUGGESTION
Perhaps you should start with a GROUP BY ... HAVING
query like this
SELECT table_name,COUNT(1) table_count
FROM information_schema.tables
WHERE table_schema NOT IN
('information_schema','performance_schema','mysql')
GROUP BY table_name HAVING COUNT(1) > 1;
This will definitely give all tables whose name appears in multiple databases
Form that as a subquery and join it to gather all databases the table appears in
SELECT
A.table_name,
GROUP_CONCAT(B.table_schema) TheTableAppearsInTheseDatabases
FROM
(
SELECT table_name,COUNT(1) table_count
FROM information_schema.tables
WHERE table_schema NOT IN
('information_schema','performance_schema','mysql')
GROUP BY table_name HAVING COUNT(1) > 1
) A INNER JOIN information_schema.tables B
USING (table_name) GROUP BY A.table_name;
Please notice that I use INNER JOIN
rather than LEFT JOIN
because it will really form a Cartesian product (2704 X 2704) and then perform comparisons.
I know this works because I tried it out in MySQL 5.5.12 on my Windows7 machine
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mysql> SELECT
-> A.table_name,
-> GROUP_CONCAT(B.table_schema) TheTableAppearsInTheseDatabases
-> FROM
-> (
-> SELECT table_name,COUNT(1) table_count
-> FROM information_schema.tables
-> WHERE table_schema NOT IN
-> ('information_schema','performance_schema','mysql')
-> GROUP BY table_name HAVING COUNT(1) > 1
-> ) A INNER JOIN information_schema.tables B
-> USING (table_name) GROUP BY A.table_name;
+--------------------------+-------------------------------------------------------------------------------------------------------------------+
| table_name | TheTableAppearsInTheseDatabases |
+--------------------------+-------------------------------------------------------------------------------------------------------------------+
| a | junk,test,robottinosino |
| acl | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive |
| blocks | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| blog | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive |
| blog_category | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| blog_entrycat | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive |
| blog_meta | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_archive,weisci_jaws_staging2 |
| blog_trackback | weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_staging |
| calendar_events | weisci_jaws_staging,weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2 |
| calendar_meta | weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_staging |
| calendar_questions | weisci_jaws_staging,weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2 |
| calendar_tickets | weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_staging |
| calendar_transactions | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_staging,weisci_jaws_archive |
| captcha_complex | weisci_jaws_staging,weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2 |
| change_log | test,junk |
| chat_staff | test,junk |
| comments | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_staging,weisci_jaws_archive |
| donations_charities | weisci_jaws_staging,weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2 |
| donations_charities_meta | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| donations_donations | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| foo_reference1 | timpost1,timpost2 |
| foo_reference2 | timpost1,timpost2 |
| foo_reference3 | timpost1,timpost2 |
| groups | weisci_jaws_staging,weisci_jaws_archive,weisci_jaws_live,weisci_jaws_staging2 |
| ipvisitor | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| job_post | giannosfor,test |
| layout | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| listeners | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| mediamanager_files | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_staging |
| mediamanager_group | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| mediamanager_photos | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| mediamanager_video | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| menus | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| menus_groups | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| mytable | ryanzec,user1267617,cabita,dotancohen,johnlocke,neeraj,test,user391986,cool_cs,javier,mathieu |
| mytext | jakobud,newstuff |
| occupation_field | giannosfor,test |
| policy_agentblock | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| policy_ipblock | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| prova | veto,vito |
| registry | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| registry_bk | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| session | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| static_pages | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| static_pages_translation | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| t | preeti,rollup_test |
| t1 | abidibo,test |
| t2 | test,abidibo |
| t3 | test,abidibo |
| table1 | table_test,supercoolville,test |
| table2 | supercoolville,test,table_test |
| tags | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| tags_content | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| tbl_banner_position | weisci_jaws_staging2,weisci_jaws_live |
| tbl_banner_upload | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| tbl_global_banner | weisci_jaws_staging2,weisci_jaws_live |
| tms_authors | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| tms_repositories | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| tms_themes | weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging |
| updates | test,junk |
| url_aliases | weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2,weisci_jaws_archive |
| url_maps | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| users | weisci_jaws_archive,weisci_jaws_staging,giannosfor,veto,weisci_jaws_live,weisci_jaws_staging2,friends,sample,vito |
| users_groups | weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live,weisci_jaws_staging2 |
| users_meta | weisci_jaws_staging2,weisci_jaws_archive,weisci_jaws_staging,weisci_jaws_live |
+--------------------------+-------------------------------------------------------------------------------------------------------------------+
65 rows in set (0.91 sec)
mysql>
Give it a Try !!!
Best Answer
3 suggestions...
Don't store all of
"http://count.io/vb/product37/1468038731"
, it wastes space and time. Trim it down to just the timestamp.Don't store the time, bump a counter for the day (or hour, if you prefer).
Don't store anything, parse the web server logs later.
Now let me approach it a different way... What is the minimal information you want? Exact times of all hits? Running counter of hits? Daily counts? Keep in mind what information can be derived from what other info. Hourly counts --> daily counts. Running counter --> daily counts (if you grab the count every midnight). Etc.