I have an identity column and a string value stored as a blob in 2 columns in my db.
What I’m trying to do is search for multiple values within the string and return the results in different rows for each match.
For example:
ID | String
1000 | ChrisBobTomSteve
I want to search the string for both Bob and Tom and return the results like this:
1000 | Bob
1000 | Tom
This is a simplified example but I have a very large db and I need to match on 39 different values to parse out the results so a union isn’t exactly efficient for this.
This is being done in oracle 11g. Any thoughts would be greatly appreciated. Thank you
Related
I have a quick question regarding writing a SQL query to obtain a complete entry from two or more entries where the data is missing in different columns.
This is the example, suppose I have this table:
Client Id | Name | Email
1234 | John | (null)
1244 | (null) | john#example.com
Would it be possible to write a query that would return the following?
Client Id | Name | Email
1234 | John | john#example.com
I am finding this particularly hard because these are 2 entires in the same table.
I apologize if this is trivial, I am still studying SQL and learning, but I wasn't able to come up with a solution for this and I although I've tried looking online I couldn't phrase the question in the proper way, I suppose and I couldn't really find the answer I was after.
Many thanks in advance for the help!
Yes, but actually no.
It is possible to write a query that works with your example data.
But just under the assumption that the first part of the mail is always equal to the name.
SELECT clients.id,clients.name,bclients.email FROM clients
JOIN clients bclients ON upper(clients.name) = upper(substring(bclients.email from 0 for position('#' in bclients.email)));
db<>fiddle
Explanation:
We join the table onto itself, to get the information into one row.
For this we first search for the position of the '#' in the email, get the substring from the start (0) of the string for the amount of characters until we hit the # (result of positon).
To avoid case-problems the name and substring are cast to uppercase for comparsion.
(lowercase would work the same)
The design is flawed
How can a client have multiple ids and different kind of information about the same user at the same time?
I think you want to split the table between clients and users, so that a user can have multiple clients.
I recommend that you read information about database normalization as this provides you with necessary knowledge for successfull database design.
I have a table A within a dataset in Bigquery. This table has multiple columns and one of the columns called hits_eventInfo_eventLabel has values like below:
{ID:AEEMEO,Score:8.990000;ID:SEAMCV,Score:8.990000;ID:HBLION;Property
ID:DNSEAWH,Score:0.391670;ID:CP1853;ID:HI2367;ID:H25600;}
If you write this string out in a tabular form, it contains the following data:
**ID | Score**
AEEMEO | 8.990000
SEAMCV | 8.990000
HBLION | -
DNSEAWH | 0.391670
CP1853 | -
HI2367 | -
H25600 | -
Some IDs have scores, some don't. I have multiple records with similar strings populated under the column hits_eventInfo_eventLabel within the table.
My question is how can I parse this string successfully WITHIN BIGQUERY so that I can get a list of property ids and their respective recommendation scores (if existing)? I would like to have the order in which the IDs appear in the string to be preserved after parsing this data.
Would really appreciate any info on this. Thanks in advance!
I would use combination of SPLIT to separate into different rows and REGEXP_EXTRACT to separate into different columns, i.e.
select
regexp_extract(x, r'ID:([^,]*)') as id,
regexp_extract(x, r'Score:([\d\.]*)') score from (
select split(x, ';') x from (
select 'ID:AEEMEO,Score:8.990000;ID:SEAMCV,Score:8.990000;ID:HBLION;Property ID:DNSEAWH,Score:0.391670;ID:CP1853;ID:HI2367;ID:H25600;' as x))
It produces the following result:
Row id score
1 AEEMEO 8.990000
2 SEAMCV 8.990000
3 HBLION null
4 DNSEAWH 0.391670
5 CP1853 null
6 HI2367 null
7 H25600 null
You can write your own JavaScript functions in BigQuery to get exactly what you want now: http://googledevelopers.blogspot.com/2015/08/breaking-sql-barrier-google-bigquery.html
I have a table with a column that includes a handful of numbers delimited by a comma. I need to select * rows that include a particular value. I am using SQL Server and C# so it can be in SQL or LINQ.
The data in my channels column (varchar) looks something like this: 1,5,8,22,27,33
My Media table looks like this:
MediaID MediaName MediaDate ChannelIDs
------- --------- --------- ----------
1 | The Cow Jumped Over The Moon | 01/18/2015 | 1,5,8,22,27,33
2 | The Cat In The Hat | 01/18/2015 | 2,4,9,25,28,31
3 | Robin Hood The Thief | 01/18/2015 | 3,5,6,9,22,33
4 | Jingle Bells Batman Smells | 01/18/2015 | 6,7,9,24,25,32
5 | Up The River Down The River | 01/18/2015 | 5,6,10,25,26,33
etc...
My Channels Table looks like this:
ChannelID ChannelName
--------- -----------
1 Animals
2 Television
3 Movies
4 Nursery Rhymes
5 Holidays
etc...
Each row of Media could contain multiple channels.
Should I be using a contains search like this?
SELECT * FROM Media WHERE CONTAINS (Channels,'22')
This would require me to full-text index this column but I don't really want to include this column in my full-text index.
Is there a better way to do this?
Thanks
You should fix your data format so you are not storing numbers as comma-delimited strings. SQL has a great data structure for lists, it is called a table not a string. In particular, you want a junction table with one row per "media" entity and id.
That said, sometimes you are stuck with a particular data structure. If so, you can use like:
where ','+channels+',' like '%,22,%'
Note: this cannot take advantage of regular indexes, so performance will not be good. Fix the data structure if you have a large table and need better performance.
i have string of value like "4,3,8"
and i had comma separated column in table as below.
ID | PrdID | cntrlIDs
1 | 1 | 4,8
2 | 2 | 3
3 | 3 | 3,4
4 | 4 | 5,6
5 | 5 | 10,14,18
i want only those records from above table which match in above mention string
eg.
1,2,3 this records will need in output because its match with the passing string of "4,3,8"
Note : i need this in entity framework LINQ Query.
string[] arrSearchFilter = "4,3,8".Split(',');
var query = (from prdtbl in ProductTables
where prdtbl.cntrlIDs.Split(',').Any(x=> arrSearchFilter.Contains(x))
but its not working and i got below error
LINQ to Entities does not recognize the method 'System.String[] Split(Char[])' method, and this method cannot be translated into a store expression.
LINQ to Entities tries to convert query expressions to SQL. String.Split is not one of the supported methods. See http://msdn.microsoft.com/en-us/library/vstudio/bb738534(v=vs.100).aspx
Assuming you are unable to redesign the database structure, you have to bypass the SQL filter and obtain ALL records and then apply the filter. You can do this by using ProductTables.ToList() and then using this in second query with the string split, e.g.
string[] arrSearchFilter = "4,3,8".Split(',');
var products = ProductTables.ToList();
var query = (from prdtbl in products
where prdtbl.cntrlIDs.Split(',').Any(x=> arrSearchFilter.Contains(x))
This is not a good idea if the Product table is large, as you are losing a key benefit of SQL and loading ALL the data before filtering.
Redesign
If that is a problem and you can change the database structure, you should create a child table that replaces the comma-separated values with a proper normalised structure. Comma separated variables might look like a convenient shortcut but they are not a good design and as you have found, are not easy to work with in SQL.
SQL
If the design cannot be changed and the table is large, then your only other option is to hand-roll the SQL and execute this directly, but this would lose some of the benefits of having Linq.
I need to pull the record containing the highest value, specifically I only need the value from that field. The problem is that the column is nvarchar format that contains a mix of numbers and special characters. The following is just an example:
PK | Column 2 (nvarchar)
-------------------
1 | .1.1.
2 | .10.1.1
3 | .5.1.7
4 | .4.1.
9 | .10.1.2
15 | .5.1.4
Basically, because of natural sort, the items in column 2 are sorted as strings. So instead of returning the PK for the row containing ".10.1.2" as the highest value i get the PK for the row that contains ".5.1.7" instead.
I attempted to write some functions to do this but it seems what I've written looked way more complicated than it should be. Anyone got something simple or complicated functions are the only way?
I want to make clear that I'm trying to grab the PK of the record that contains the highest Column 2 value.
This query might return what you desire
SELECT MAX(CAST(REPLACE(Column2, '.', '') as INT)) FROM table