In my example I have this table :
| name | number |
-------------------
| abc | |
| bca | |
| sad | |
| tyu | |
| hjh | |
| lpk | |
| ass | |
| drc | |
| dfg | |
then i get some variable filled with number like :
$order = 3, then i want to make query to update the table above to look like this :
| name | number |
--------------------
| abc | 1 |
| bca | 2 |
| sad | 3 |
| tyu | 1 |
| hjh | 2 |
| lpk | 3 |
| ass | 1 |
| drc | 2 |
| dfg | 3 |
How do I do that in mysql query??
Thanks in advance guys
SET #order=3;
UPDATE Table1 SET number2=MOD(number-1,#order)+1;
Related
+---------+----------------+--------+
| aid | fn | col_no |
+---------+----------------+--------+
| 2011768 | ABDUL | 5 |
| 2011499 | ABDULLA | 4 |
| 2011198 | ADNAN | 3 |
| 2011590 | AKSHAYA PRAISY | 2 |
| 2011749 | AMIR | 1 |
| 2011213 | AMOGHA | 5 |
| 2011027 | ANU | 4 |
| 2011046 | ANUDEV D | 3 |
| 2011435 | B S SAHANA | 2 |
| 2011112 | BENAKA | 1 |
+---------+----------------+--------+
How to sort the number like col_no as 1 2 3 4 5 and again repeat as 1 2 3 4 5?
i need output like this
+---------+----------------+--------+
| aid | fn | col_no |
+---------+----------------+--------+
| 2011749 | AMIR | 1 |
| 2011590 | AKSHAYA PRAISY | 2 |
| 2011198 | ADNAN | 3 |
| 2011499 | ABDULLA | 4 |
| 2011768 | ABDUL | 5 |
| 2011112 | BENAKA | 1 |
| 2011435 | B S SAHANA | 2 |
| 2011046 | ANUDEV D | 3 |
| 2011027 | ANU | 4 |
| 2011213 | AMOGHA | 5 |
+---------+----------------+--------+
You can use row_number() partition by col_no:
select t.*
from t
order by row_number() over (partition by col_no order by fn),
col_no;
Here is a db<>fiddle.
May be this is really a simple question, thanks in advance.
What I currently have:
+-----+---+---+---+---+
| sid | a | b | c | d |
+-----+---+---+---+---+
| 123 | | | | 4 |
| 123 | | 2 | | |
| 123 | | | 3 | |
| 123 | 1 | | | |
| 456 | | 5 | | |
| 456 | | | 6 | |
| 789 | | | | 8 |
| 789 | 7 | | | |
+-----+---+---+---+---+
What I am trying to get:
+-----+------+------+------+------+
| sid | a | b | c | d |
+-----+------+------+------+------+
| 123 | 1 | 2 | 3 | 4 |
| 456 | | 5 | 6 | |
| 789 | 7 | | | 8 |
+-----+------+------+------+------+
How such "rows concatenation" could be done in MySQL?
You can do this with the MAX() aggregation function with a GROUP BY clause in your query.
SELECT sid, MAX(a), MAX(b), MAX(c), MAX(d)
FROM table
GROUP BY sid
I used MAX() because it will filter the NULL values with others values.
More explanation here : MySQL Documentation
I have a question very similar to this one, but different (aka, I couldn't extend the answer to that one to fit my purposes. Due to the second WHERE condition, specifically).
I have a table which tracks the visit number for customers. There are two types of visits:
| ID | InStoreVisit | InStoreDate | OnlineVisit | OnlineDate |
|----|--------------|-------------|-------------|------------|
| 1 | 1 | 1/1/11 | | |
| 1 | 2 | 1/2/11 | | |
| 1 | | | 1 | 1/3/11 |
| 1 | 3 | 1/4/11 | | |
| 2 | | | 1 | 2/2/12 |
| 2 | 1 | 2/3/12 | | |
| 2 | | | 2 | 2/4/12 |
I need to create a new column which has a sort of 'global visit number' as such:
| ID | InStoreVisit | InStoreDate | OnlineVisit | OnlineDate | GobalVisit |
|----|--------------|-------------|-------------|------------|------------|
| 1 | 1 | 1/1/11 | | | 1 |
| 1 | 2 | 1/2/11 | | | 2 |
| 1 | | | 1 | 1/3/11 | 3 |
| 1 | 3 | 1/4/11 | | | 4 |
| 2 | | | 1 | 2/2/12 | 1 |
| 2 | 1 | 2/3/12 | | | 2 |
| 2 | | | 2 | 2/4/12 | 3 |
I'm getting mixed up on the WHERE condition with which I can do the self-join. Any advice greatly appreciated.
I have a table callInfo and it looks like this:
+----+------------------------------------------------------------------------------------------------------------------------------------+
| id | idUrl | collectionId | |
+----+------------------------------------------------------------------------------------------------------------------------------------+
| 1 | id?books.0.levelOfDetail=high&books.0.shopId=727&books.0.type=books&collectionId=20092014&type=seasonPassSource | |
| 2 | id:call3?books.0.levelOfDetail=high&books.0.shopId=123&books.0.type=books&collectionId=16645&type=seasonPassSource | |
| 3 | id:call3?maxDepth=1&parentMixId=777&type=mixSource | |
| 4 | idSet:call3?keyword=%22FOO%20BAR%20.%5E%24*%2B%3F%7C%28%29%7B%7D%5B%5D%22&type=wishListSource | |
| 5 | idSet:call3?books.0.levelOfDetail=high&books.0.shopId=727 | |
| 6 | idSetSource.0.booksNumber=2&collectionId=16645&books.0.levelOfDetail=high&books.0.type=books&type=seasonPassSource | |
| 7 | idSet:call3?keyword=hero&type=wishListSource | |
+----+-------------------------+----------------------------------------------------------------------------------------------------------+
I have created a new column called collectionId in the table callInfo, but the are many records in the table for which I need to update this column value.
I need to extract the value of collectionId from idUrl column and put it in collectionId column.
it should look like this
+----+------------------------------------------------------------------------------------------------------------------------------------+
| id | idUrl | collectionId | |
+----+------------------------------------------------------------------------------------------------------------------------------------+
| 1 | id?books.0.levelOfDetail=high&books.0.shopId=727&books.0.type=books&collectionId=20092014&type=seasonPassSource | 20092014 |
| 2 | id:call3?books.0.levelOfDetail=high&books.0.shopId=123&books.0.type=books&collectionId=16645&type=seasonPassSource | 16645 |
| 3 | id:call3?maxDepth=1&parentMixId=777&type=mixSource | NULL |
| 4 | idSet:call3?keyword=%22FOO%20BAR%20.%5E%24*%2B%3F%7C%28%29%7B%7D%5B%5D%22&type=wishListSource | NULL |
| 5 | idSet:call3?books.0.levelOfDetail=high&books.0.shopId=727 | NULL |
| 6 | idSetSource.0.booksNumber=2&collectionId=16645&books.0.levelOfDetail=high&books.0.type=books&type=seasonPassSource | 16645 |
| 7 | idSet:call3?keyword=hero&type=wishListSource | NULL |
+----+-------------------------+----------------------------------------------------------------------------------------------------------+
I need to do this in MySQL. Any ideas?
Another way to do it using SUBSTRING_INDEX()
UPDATE callInfo
SET collectionId = SUBSTRING_INDEX(SUBSTR(idUrl, INSTR(idUrl, 'collectionId=') + 13), '&', 1)
WHERE idUrl LIKE '%collectionId=%'
Output:
| ID | ... | COLLECTIONID |
|----| ... |--------------|
| 1 | ... | 20092014 |
| 2 | ... | 16645 |
| 3 | ... | (null) |
| 4 | ... | (null) |
| 5 | ... | (null) |
| 6 | ... | 16645 |
| 7 | ... | (null) |
Here is SQLFiddle demo
I recently increased the level of normalisation in my database, going from something like this:
+--------------------------------------+
| state_changes |
+----+-------+-----------+------+------+
| ID | Name | Timestamp | Val1 | Val2 |
+----+-------+-----------+------+------+
| 0 | John | 17:19:01 | A | X |
| 1 | Bob | 17:19:02 | E | W |
| 2 | John | 17:19:05 | E | Y |
| 3 | John | 17:19:06 | B | Y |
| 4 | John | 17:19:12 | C | Z |
| 5 | John | 17:19:15 | A | Z |
+----+-------+-----------+------+------+
To something more like this:
+-------------------------------+ +-------------------------------+
| state_changes_1 | | state_changes_2 |
+----+-------+-----------+------+ +----+-------------------+------+
| ID | Name | Timestamp | Val1 | | ID | Name | Timestamp | Val2 |
+----+-------+-----------+------+ +----+-------+-----------+------+
| 0 | John | 17:19:01 | A | | 0 | John | 17:19:01 | X |
| 1 | Bob | 17:19:02 | E | | 1 | Bob | 17:19:02 | W |
| 2 | John | 17:19:05 | E | | 2 | John | 17:19:05 | Y |
| 3 | John | 17:19:06 | B | | 3 | John | 17:19:06 | Y |
| 4 | John | 17:19:12 | C | | 4 | John | 17:19:12 | Z |
| 5 | John | 17:19:15 | A | | 5 | John | 17:19:15 | Z |
+----+-------+-----------+------+ +----+-------+-----------+------+
How could I now write a query to "compact" the two resulting tables where values are duplicated?
I want to ignore the ID field when considering row uniqueness;
I want to ignore the Timestamp when considering row uniqueness;
But fields must be sequential (under a Name,Timestamp ordering) to be considered duplicates.
The result, in this example, should be:
+-------------------------------+ +-------------------------------+
| state_changes_1 | | state_changes_2 |
+----+-------+-----------+------+ +----+-------+-----------+------+
| ID | Name | Timestamp | Val1 | | ID | Name | Timestamp | Val2 |
+----+-------+-----------+------+ +----+-------+-----------+------+
| 0 | John | 17:19:01 | A | | 0 | John | 17:19:01 | X |
| 1 | Bob | 17:19:02 | E | | 1 | Bob | 17:19:02 | W |
| 3 | John | 17:19:06 | B | | 2 | John | 17:19:05 | Y |
| 4 | John | 17:19:12 | C | | 4 | John | 17:19:12 | Z |
| 5 | John | 17:19:15 | A | +----+-------+-----------+------+
+----+-------+-----------+------+
My tables have several billion rows so I'm looking for something that takes efficiency into consideration; that said, I'm a realistic sort of person so I'm happy for the query to take an hour or two to run (including index rebuilds) if needs be.
I tried this on MySQL 5.1.58 and it seems to work with your test data.
SET #name = NULL;
SET #val1 = NULL;
UPDATE state_changes_1
SET Val1 = IF(Name=#name AND Val1=#val1, NULL, (#val1:=Val1)),
Name = (#name:=Name)
ORDER BY Name, `Timestamp`;
DELETE FROM state_changes_1 WHERE Val1 IS NULL;
Your problem is your concept of 'sequential' or consecutive duplicate doesn't exist in relational algebra so won't be able to do it in sql. You can get easily the latest timestamp of each state by doing
SELECT id, name, MAX(timestamp) ts , state FROM states
GROUP BY id, name, state
ORDER BY ts
However, you could do what you want by dumping your table into a text file and do a simple script in which ever language you are confortable with, perl, ruby python etc. Even on a million row table that could be done quiet quickly