A great fellow helped me with developing the following statement. However, in mySQL - I cannot save a view with a subquery in the FROM clause. Any suggestions o nhow to rewrite this so that it can be saved into a mySQL server?
SELECT t.idPatternMetadata, SUBSTRING_INDEX(SUBSTRING_INDEX(t.sKeywords, ',', n.n), ',', -1) color , count(*) as counts
FROM tblPatternMetadata t CROSS JOIN
(
SELECT a.N + b.N * 10 + 1 n
FROM
(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) a
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) b
ORDER BY n
) n
WHERE n.n <= 1 + (LENGTH(t.sKeywords) - LENGTH(REPLACE(t.sKeywords, ',', '')))
group by color
THANKS in advance!
One option is to create a table that contains the 100 integer values, and reference that table in the query.
CREATE TABLE n (n INT UNSIGNED PRIMARY KEY);
INSERT INTO n (n)
SELECT a.n + b.n * 10 + 1 n
FROM ( SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3
UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6
UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9
) a
CROSS
JOIN ( SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3
UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6
UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9
) b
ORDER BY 1;
Then rewrite your query to reference the table in place of the inline view:
SELECT t.idPatternMetadata, SUBSTRING_INDEX(SUBSTRING_INDEX(t.sKeywords, ',', n.n), ',', -1) AS color
, count(*) AS counts
FROM tblPatternMetadata t
JOIN n
ON n.n <= 1 + (LENGTH(t.sKeywords) - LENGTH(REPLACE(t.sKeywords, ',', '')))
GROUP BY color
Related
I want to populate a table with unique random numbers without using a procedure.
I've tried using this reply to do it but not success.
What I'm trying to do is something like this but validating that numbers are not repeated:
INSERT into table (row1,row2)
WITH RECURSIVE
cte AS ( SELECT 0 num, LPAD(FLOOR(RAND() * 99999999),8,0) random_num
UNION ALL
SELECT num+1, LPAD(FLOOR(RAND() * 99999999),8,0) random_num
FROM cte WHERE num < 100000-1)
SELECT random_num, null
FROM cte;
In the example above, I am able to generate random values and insert them but without validating that the numbers are not repeated.
I have tried to do this:
INSERT into table (row1,row2)
WITH RECURSIVE
cte AS ( SELECT 0 num, LPAD(FLOOR(RAND() * 99999999),8,0) random_num
UNION ALL
SELECT num+1, LPAD(FLOOR(RAND() * 99999999),8,0) random_num
FROM cte WHERE num < 100000-1 AND random_num NOT IN (SELECT random_num FROM cte WHERE random_num IS NOT NULL))
SELECT random_num, null
FROM cte;
but the condition AND random_num NOT IN (SELECT random_num FROM cte WHERE random_num IS NOT NULL) in the where case, causes an SQL Error [4008] [HY000]: Restrictions imposed on recursive definitions are violated for table 'cte'
Any suggestions of how to do it? thank you!.
This could be an option. Generate all possible values, sort randomly and take desired number of entries.
CREATE TABLE random_data (
row1 INT PRIMARY KEY AUTO_INCREMENT,
row2 VARCHAR(10) NOT NULL,
UNIQUE KEY _Idx1 ( row2 )
);
INSERT INTO random_data (row2)
SELECT LPAD(num, 8, 0)
FROM (
SELECT h * 10000000 + g * 1000000 + f * 100000 + e * 10000 + d * 1000 + c * 100 + b * 10 + a AS num
FROM (SELECT 0 a UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) ta
JOIN (SELECT 0 b UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) tb
JOIN (SELECT 0 c UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) tc
JOIN (SELECT 0 d UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) td
JOIN (SELECT 0 e UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) te
JOIN (SELECT 0 f UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) tf
JOIN (SELECT 0 g UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) tg
JOIN (SELECT 0 h UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) th
) n
ORDER BY RAND()
LIMIT 100000;
If you have a table - any table - with e.g. 100 rows then you can generate million distinct random numbers between 0 and 99999999 as follows:
select distinct floor(rand() * 100000000)
from t as t0, t as t1, t as t2
limit 1000000
Note that because of distinct you will need to generate a bigger number of rows so that you get desired number of rows after distinct.
Database Table
ID Post Tags
1 Range rover range-rover,cars
2 Lamborghini lamborghini,cars
3 Kawasaki kawasaki,bikes
4 Yamaha R1 yamaha,r1,bikes
I Want to Remove Duplicate Values from Result sql
What i Get When i fetch tags (tags are in ,) from Database
SELECT Tags from posts;
Resut:
range-rover,cars lamborghini,cars kawasaki,bikes yamaha,r1,bikes
What I Need is not to show same result again.
range-rover,cars lamborghini kawasaki,bikes yamaha,r1
You can split your text using tally table and SUBSTRING_INDEX:
SELECT DISTINCT SUBSTRING_INDEX(SUBSTRING_INDEX(t.tags, ',', n.n), ',', -1) AS val
FROM posts t
CROSS JOIN
(
SELECT a.N + b.N * 10 + 1 n
FROM
(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) a
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) b
) n
WHERE n.n <= 1 + (LENGTH(t.tags) - LENGTH(REPLACE(t.tags, ',', '')))
SqlFiddleDemo
If you need one row add GROUP_CONCAT:
SELECT GROUP_CONCAT(DISTINCT SUBSTRING_INDEX(SUBSTRING_INDEX(t.tags, ',', n.n), ',', -1)) AS val
...
SqlFiddleDemo2
let's explain briefly
this is very new topic, I want to fetch only particular word start with # from sentence for example
i have sentence like
Hi Majjx Uxud Xhhxhd Hx Dhx #hdhd Jdhhdhshhfd Hxhhd #bhd Hxhd Hxhhd Dhhdh www.myinnos.in Hdhd Xfhhxhd Xhhdh Xhx 9560233669 ndhdh Hxhhdh Dhh
from above sentence I have to fetch #hdhd
got a solution for my question, now I want to count and show the repeated words as count
select val from(
select (substring_index(substring_index(a, ' ', n.n), ' ', -1)) val
from (select id, message as a from filmbooknewsfeed) t
cross join(
select a.n + b.n * 10 + 1 n
from
(select 0 as n union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9
) a,
(select 0 as n union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9
) b
order by n
) n
where n.n <= 1 + (length(t.a) - length(replace(t.a, ' ', '')))
order by val asc
)x where val like '#%'
As I said, you need to convert the sentence into rows. Just in case, if in sentence you have more than 1 words start with #.
select val from(
select (substring_index(substring_index(a, ' ', n.n), ' ', -1)) val
from (
select 'Hi Majjx Uxud Xhhxhd Hx Dhx #hdhd Jdhhdhshhfd Hxhhd #bhd Hxhd Hxhhd Dhhdh www.myinnos.in Hdhd Xfhhxhd Xhhdh Xhx 9560233669 ndhdh Hxhhdh Dhh' as a
) t
cross join(
select a.n + b.n * 10 + 1 n
from
(select 0 as n union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9
) a,
(select 0 as n union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9
) b
order by n
) n
where n.n <= 1 + (length(t.a) - length(replace(t.a, ' ', '')))
order by val asc
)x where val like '#%'
Will give you #hdhd. even if you has more than 1 # in the sentence. This would give you correct result.
edit
If you want to group by result and sort by most occurence words like twitter tranding topic, modify your query like this (as query on the question)
select val,count(val) as cnt from(
select (substring_index(substring_index(a, ' ', n.n), ' ', -1)) val
from (select id, message as a from filmbooknewsfeed) t
cross join(
select a.n + b.n * 10 + 1 n
from
(select 0 as n union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9
) a,
(select 0 as n union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9
) b
order by n
) n
where n.n <= 1 + (length(t.a) - length(replace(t.a, ' ', '')))
order by val asc
)x where val like '#%'
group by val
order by cnt desc
You can do this using substring_index():
select substring_index(substring_index(substring_index(sentence, '#', 2), '#', -1), ' ', 1)
This code returns me the most used words in a column in TEXT format called description and is on the table 'messages`.
However I can not stick this in the WHERE code:
messages.tag = 'HELLO'
I need it to do what it already does, but with this WHERE I tried this code and gave not sure:
SELECT message, count(message) as count
FROM (
SELECT
messages.id,
SUBSTRING_INDEX(SUBSTRING_INDEX(messages.message, ' ', count.n), ' ', -1) as message
FROM
(select (h*100+t*10+u+1) n from
(select 0 h union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9) A,
(select 0 t union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9) B,
(select 0 u union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9) C
) as count
INNER JOIN messages
ON CHAR_LENGTH(messages.message)-CHAR_LENGTH(REPLACE(messages.message, ' ',''))>=count.n-1
ORDER BY id, n
) x
WHERE LENGTH(message) >= 5
AND messages.tag = 'HELLO'
GROUP BY message
ORDER BY count DESC
LIMIT 10
You have to move that where clause into the subquery. The messages alias is not known in the outer query:
FROM (SELECT messages.id,
SUBSTRING_INDEX(SUBSTRING_INDEX(messages.message, ' ', count.n), ' ', -1) as message
FROM (select (h*100+t*10+u+1) n
from (select 0 h union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9) A,
(select 0 t union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9) B,
(select 0 u union select 1 union select 2 union select 3 union select 4 union
select 5 union select 6 union select 7 union select 8 union select 9) C
) count INNER JOIN
messages
ON CHAR_LENGTH(messages.message)-CHAR_LENGTH(REPLACE(messages.message, ' ','')) >= count.n-1
WHERE messages.tag = 'HELLO'
ORDER BY id, n
) x
The other condition stays in the outer query.
Try this,
I think messages.tag should be like, not equal to 'HELLO'
SELECT message, count(message) as count
FROM (
SELECT
messages.id,
SUBSTRING_INDEX(SUBSTRING_INDEX(messages.message, ' ', count.n), ' ', -1) as message
FROM
(
select (h*100+t*10+u+1) n
from
(
select 0 h union select 1 union select 2 union select 3 union select 4
union
select 5 union select 6 union select 7 union select 8 union select 9) A,
(select 0 t union select 1 union select 2 union select 3 union select 4
union
select 5 union select 6 union select 7 union select 8 union select 9) B,
(select 0 u union select 1 union select 2 union select 3 union select 4
union
select 5 union select 6 union select 7 union select 8 union select 9) C
) count
INNER JOIN messages
ON CHAR_LENGTH(messages.message)-CHAR_LENGTH(REPLACE(messages.message, ' ',''))>=count.n-1
WHERE messages.tag like '%HELLO%'
ORDER BY id, n
) x
WHERE LENGTH(message) >= 5
GROUP BY message
ORDER BY count DESC
LIMIT 10
I do an update in a table row by row:
UPDATE table
SET col = $value
WHERE id = $id
Now if I update e.g. 10000 records each record gets the $value but it does not really matter which $id gets which $value. The only requirement I have is that all the records I am updating end up with a $value.
So how could I convert this update to something like
UPDATE table
SET col ?????? what here from a $value_list???
WHERE id IN ($id_list)
I.e. pass the list ids and somehow the values and that range of ids get a value
Let's assume you've got two comma separated lists of your ids and your values with the same count of items. Then you could do your update with statements like those:
-- the list of the ids
SET #ids = '2,4,5,6';
-- the list of the values
SET #vals = '17, 73,55, 12';
UPDATE yourtable
INNER JOIN (
SELECT
SUBSTRING_INDEX(SUBSTRING_INDEX(t.ids, ',', n.n), ',', -1) id,
SUBSTRING_INDEX(SUBSTRING_INDEX(t.vals, ',', n.n), ',', -1) val
FROM (SELECT #ids as ids, #vals as vals) t
CROSS JOIN (
-- build for up to 1000 separated values
SELECT
1 + a.N + b.N * 10 + c.N * 100 AS n
FROM
(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) a
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) b
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) c
ORDER BY n
) n
WHERE n <= (1 + LENGTH(t.ids) - LENGTH(REPLACE(t.ids, ',', '')))
) t1
ON
yourtable.id = t1.id
SET
yourtable.val = t1.val;
Explanation
The inner series of UNIONs builds a table with the numbers from 1 to 1000. You should be able to expand this mechanism to your needs:
-- build for up to 1000 separated values
SELECT
a.N + b.N * 10 + c.N * 100 + 1 AS n
FROM
(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) a
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) b
,(SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) c
ORDER BY n
We use this numbers to get the items out of our lists with the nested SUBSTRING_INDEX call
SUBSTRING_INDEX(SUBSTRING_INDEX(t.ids, ',', n.n), ',', -1) id,
SUBSTRING_INDEX(SUBSTRING_INDEX(t.vals, ',', n.n), ',', -1) val
The WHERE clause get the number of items in (ok only one of the two) lists:
WHERE n <= (1 + LENGTH(t.ids) - LENGTH(REPLACE(t.ids, ',', '')))
Because we've got one occurence of the separator less, we add 1 to the difference in length of the list with the separator and the length of the list without all occurrences of the separator.
Then we do the UPDATE with a JOIN operation on the id values in the outer UPDATE statement.
See it working in this fiddle.
Believe me: This is much faster than agonizing row-by-row update.