What I'm trying to do its edit the information from a row adding more data, for example:
select name, obs from users where area='it'
It gives me:
name obs
charles vegetarian
xena otaku
and I want to add to the their obs 'friendly hard worker'
I have tried:
update users set obs=obs+' frienly hard worker' where area='it'
but it didn't work, the result that I want is:
name obs
charles vegetarian frienly hard worker
xena otaku frienly hard worker
In MySQL, the plus sign + is an operand for performing arithmetic operations.
You need to use the CONCAT() function to concatenate strings together.
UPDATE users
SET obs = CONCAT(obs,' frienly hard worker')
WHERE area='it';
update users set obs= CONCAT('string1', column1 , 'string2', column1 , 'string3' ) where area='it'
Related
I've got a machine log available in an SQL table. I can do a bit in SQL, but I'm not good enough to process the following:
In the data column there are entries containing "RUNPGM: Recipe name" and "RUNBRKPGM: Recipe name"
What I want is a view containing 4 columns:
TimeStamp RUNPGM
TimeStamp RUNBRKPGM
Recipe Name
Time Difference in seconds
There is a bit of a catch:
Sometimes the machine logs an empty RUNBRKPGM that should be ignored
The RUNBRKPGM is sometimes logged with an error message. This entry should also be ignored.
It's always the RUNBRKPGM entry with just the recipe name that's the actual end of the recipe.
NOTE: I understand this is not a full/complete answer, but with info available in question as of now, I believe it at least helps give a starting point since this is too complicated (and formatted) to put in the comments:
If Recipe is everything in the DATA field except the 'RUNPGM = ' part you can do somethign similar to this:
SELECT
-- will give you a col for TimeStamp for records with RUNPGM
CASE WHEN DATA LIKE 'RUNPGM%' THEN TS ELSE '' END AS RUNPGM_TimeStamp,
-- will give you a col for TimeStamp for records with RUNBRKPGM
CASE WHEN DATA LIKE 'RUNBRKPGM%' THEN TS ELSE '' END AS RUNBRKPGM_TimeStamp,
-- will give you everything after the RUNPGM = (which I think is the recipe you are referring to)
CASE WHEN DATA LIKE 'RUNPGM%' THEN REPLACE(DATA, 'RUNPGM = ', '' AS RUNPGM_Recipe,
-- will give you everything after the RUNBRKPGM = (which I think is the recipe you are referring to)
CASE WHEN DATA LIKE 'RUNBRKPGM:%' THEN REPLACE(DATA, 'RUNBRKPGM = ', '' AS RUNPGM_Recipe
FROM TableName
Im not sure what columns you want to get the Time Difference on though so I dont have that column in here.
Then if you need to do additional logic/formatting on the columns once they are separated you can put the above in a sub select.
As a first swing, I'd try the following:
Create a view that uses string splitting to break the DATA column into a its parts (e.g. RunType and RecipeName)
Create a simple select that outputs the recipe name and tstamp where the runtype is RUNPGM.
Then add an OUTER APPLY:
Essentially, joining onto itself.
SELECT
t1.RecipeName,
t1.TimeStamp AS Start,
t2.TimeStamp AS Stop
--date func to get run time, pseudo DATEDIFF(xx,t1.TimeStamp, t2.TimeStamp) as RunTime
FROM newView t1
OUTER APPLY ( SELECT TOP ( 1 ) *
FROM newView x
WHERE x.RecipeName = t1.RecipeName
AND RunType = 'RUNBRKPGM'
ORDER BY ID DESC ) t2
WHERE t1.RunType = 'RUNPGM';
I think I may be trying to do too much with one query, and it's been driving me batty.
I have two tables, Source and Zip_Code. The Source table has a zip code field that can either be 3 or 5 digits.
If it's 3 digits, I need to join to the zip_code table's 3-digit field and set the Source's new_zip field to the zip_code table's corresponding 5-digit entry.
If it's 5 digits, I need to link to the zip_code table's 5-digit field (to make sure it's a valid zip code), then put that 5-digit number in the Source's new_zip field.
I already understand that you can't manipulate something you're updating, hence using a self-join to manipulate a copy. So now I need to create Source2, and join Source1, Source2, and Zip_Code tables.
UPDATE SOURCE1
INNER JOIN SOURCE2 ON SOURCE1_UID = SOURCE2_UID
INNER JOIN ZIP_CODE ON SOURCE1_ZIP =
(
SELECT
(
CASE WHEN LENGTH(SOURCE1.ZIP <4
THEN ZIP_CODE.3_DIGIT
ELSE ZIP_CODE.5_DIGIT
END
)
FROM SOURCE2
)
SET SOURCE1.NEW_ZIP =
(
CASE WHEN LENGTH(SOURCE1.ZIP <4
THEN ZIP_CODE.3_DIGIT
ELSE ZIP_CODE.5_DIGIT
END
)
I know I'm doing something majorly wrong, but I'm having a block as to where.
You're not naming the Source table in the query. You need to name the table and then give it an alias like Source1 if you have to refer to it twice.
But I don't think there's any need for the self-join.
There's no need for the subqueries, you can use conditionals in an ON clause.
UPDATE Source AS s
JOIN Zip_Code AS z ON
CASE WHEN LENGTH(s.zip) = 3
THEN z.3_digit
ELSE z.5_digit
END
SET s.new_zip = z.5_digit
Your description says that you always want to set new_zip to the 5-digit code, so there's no need for a CASE in the SET clause.
Hey guys how do you add two values on separate fields but on the same table
for example:
tblbooks
Quantity
Borrowed
each time a user issue a book to a borrower the Quantity its reduce by 1 and Borrowed is added by 1....
INSERT INTO tablename(field1,field2)
VALUES(v1,v2)
In your case I guess you need to update.
Update yourtable
SET Quantity =Quantity-1,
Borrowed=Borrowed+1
Where userid=1
The way I generally do it is select the row I want to update using LinQ and then just update the values.
For example:
With (From rw In tblBooks Select rw Where rw.Item("MyCondition").ToString = "Condition").First
.Item("Quantity") = .Item("Quantity") - 1
.Item("Borrowed") = .Item("Borrowed") + 1
End With
... I didn't test this code, and it doesn't take into account conversion, error checking, etc, but I hope it conveys the idea...
I have a table with the following fields:
id | domainname | domain_certificate_no | keyvalue
An example for the output of a select statement can be as:
'57092', '02a1fae.netsolstores.com', '02a1fae.netsolstores.com_1', '55525772666'
'57093', '02a1fae.netsolstores.com', '02a1fae.netsolstores.com_2', '22225554186'
'57094', '02a1fae.netsolstores.com', '02a1fae.netsolstores.com_3', '22444356259'
'97168', '02aa6aa.netsolstores.com', '02aa6aa.netsolstores.com_1', '55525772666'
'97169', '02aa6aa.netsolstores.com', '02aa6aa.netsolstores.com_2', '22225554186'
'97170', '02aa6aa.netsolstores.com', '02aa6aa.netsolstores.com_3', '22444356259’
I need to sanitize my db such that: I want to remove the domain names that have repeated keyvalue for the first domain_certificate_no (i.e, in this example, I look for the field domain_certificate_no: 02aa6aa.netsolstores.com_1, since it is number 1, and has repeated value for the key, then I want to remove the whole chain which is 02aa6aa.netsolstores.com_2 and 02aa6aa.netsolstores.com_3 and this by deleting the domain name that this chain belongs to which is 02aa6aa.netsolstores.com.
How can I automate the checking process for the whole DB. So, I have a query that checks any domain name in the pattern ('%.%.%) EDIT: AND they have share domain name (in this ex: netsolstores.com) , if it finds cert no. 1 that belongs to this domain name has a repeated key value, then delete. Otherwise no. Please, note tat, it is ok for domain_certificate_no to have repeated value if it is not number 1.
EDIT: I only compare the repeated valeues for the same second level domain name. Ex: in this question, I compare the values that share the domain name: .netsolstores.com. If I have another domain name, with sublevel domains, I do the same. But the point is that I don't need to compare the whole DB. Only the values with shared domain name (but different sub domain).
I'm not sure what happens with '02aa6aa.netsolstores.com_1' in your example.
The following keeps only the minimum id for any repeated key:
with t as (
select t.*,
substr(domain_certificate_no,
instr(domain_certificate_no, '_') + 1, 1000) as version,
left(domain_certificate_no, instr(domain_certificate_no, '_') - 1) as dcn
from t
)
select t.*
from t join
(select keyvalue, min(dcn) as mindcn
from t
group by keyvalue
) tsum
on t.keyvalue = tsum.keyvalue and
t.dcn = tsum.mindcn
For the data you provide, this seems to do the trick. This will not return the "_1" version of the repeats. If that is important, the query can be pretty easily modified.
Although I prefer to be more positive (thinking about the rows to keep rather than delete), the following should delete what you want:
with t as (
select t.*,
substr(domain_certificate_no,
instr(domain_certificate_no, '_') + 1, 1000) as version,
left(domain_certificate_no, instr(domain_certificate_no, '_') - 1) as dcn
from t
),
tokeep as (
select t.*
from t join
(select keyvalue, min(dcn) as mindcn
from t
group by keyvalue
) tsum
on t.keyvalue = tsum.keyvalue and
t.dcn = tsum.mindcn
)
delete from t
where t.id not in (select id from tokeep)
There are other ways to express this that are possibly more efficient (depending on the database). This, though, keeps the structure of the original query.
By the way, when trying new DELETE code, be sure that you stash a copy of the table. It is easy to make a mistake with DELETE (and UPDATE). For instance, if you leave out the WHERE clause, all the rows will disappear, after the long painful process of logging all of them. You might find it faster to simply select the desired results into a new table, validate them, then truncate the old table and re-insert them.
I am importing data to a table structured: content_id|user_id|count - all integers all comprise the composite primary key
The table I want to select it from is structured: content_id|user_id
For reasons quite specific to my use case, I will need to fire quite a lot of data into this regularly enough to want a pure MySQL solution
insert into new_db.table
select content_id,user_id,xxx from old_db.table
I want each row to go in with xxx set to 0, unless this would create a duplicate key, in which case I wish to increment the number, for the current user_id/content_id combination
Not being a MySQL expert, I tried a few options like trying to populate xxx by selecting from the target table during insert, with no luck. Also tried using ON DUPLICATE KEY to increment counters instead of the usual UPDATE. But it all seemed a bit daft so I thought I would come here!
Any ideas anyone? I have a backup option of wrapping this in PHP, but it would drastically raise the overall running time of the script in which this would be the only non-pure MySQL part
Any help really appreciated. thanks in advance!
--edit
this may sound really awful in principle. but id settle for a way to do it in an update after entering random numbers (i have sent in random numbers to allow me to continue other work at the moment) - and this is a purely dev setup
--edit again
12|234
51|45
51|45
51|45
23|67
would ideally insert
12|234|0
51|45|0
51|45|1
51|45|2
23|67|0
INSERT INTO new_db.table (content_id, user_id, cnt)
SELECT old.content_id, old.user_id, COUNT(old.*) - 1 FROM old_db.table old
GROUP BY old.content_id, old.user_id
this would be the way I would go, so if 1 entry it would put 0 on cnt, for more it would just put 1-2-3 etc.
Edit:
Your correct answer would be somewhat complicated but I tested it and it works:
INSERT INTO newtable(user_id,content_id,cnt)
SELECT o1.user_id, o1.content_id,
CASE
WHEN COALESCE(#rownum, 0) = 0
THEN #rownum:=c-1
ELSE #rownum:=#rownum-1
END as cnt
FROM
(SELECT user_id, content_id, COUNT(*) as c FROM oldtable
GROUP BY user_id, content_id ) as grpd
LEFT JOIN
(SELECT oldtable.* FROM oldtable) o1 ON
(o1.user_id = grpd.user_id AND o1.content_id = grpd.content_id)
;
Assuming that in the old db table (source), you will not have the same (content_id, user_id) combination, then you can import using this query
insert newdbtable
select o.content_id, o.user_id, ifnull(max(n.`count`),-1)+1
from olddbtable o
left join newdbtable n on n.content_id=o.content_id and n.user_id=o.user_id
group by o.content_id, o.user_id;