In the example below, I'm trying to create a query that returns the content of NAME if this contains both 'ammonium nitrate' and 'urea'. The thing is, they are in separate rows and I haven't found how to check for both. I've tried using the clauses IN, AND, and UNION, but to no avail.
The query should return only 'Gro-Fast', as it is the only NAME that contains both.
+-------+------------------+-------------+---------+
| FCODE | CNAME | NAME | CONTACT |
+-------+------------------+-------------+---------+
| 28994 | ammonium nitrate | Gro-Fast | 556698 |
| 28994 | urea | Gro-Fast | 556698 |
| 29462 | ammonium nitrate | BetterRoots | 342554 |
| 34588 | ammonium nitrate | Flourisher | 342554 |
| 83732 | urea | GreenAgain | 354211 |
+-------+------------------+-------------+---------+
TIA!
You can group by name and set the conditions in the HAVING clause:
select name
from tablename
where cname in ('ammonium nitrate', 'urea')
group by name
having count(distinct cname) = 2
If you want the column cnameto contain only 'ammonium nitrate' and 'urea':
select name
from tablename
group by name
having
sum(cname not in ('ammonium nitrate', 'urea')) = 0
and
count(distinct cname) = 2
See the demo.
Results:
> | name |
> | :------- |
> | Gro-Fast |
Edit, for your query:
select name
from CONTENTS natural join FERTILIZERS
where cname in ('ammonium nitrate', 'urea')
group by name
having count(distinct cname) = 2
I'm currently trying to update an existing database (removing duplicates).
You can see the structure as follows :
I have a database on which specific entries are marked as "Main". These entries need to be updated with data from duplicate records, only having the same name.
(Updated table to reflect my question better)
It would look like this:
+----+------+-----------------+--------------+---------+
| ID | Name | Field-To-Update | Duplication | Source |
+----+------+-----------------+--------------+---------+
| . | A | xxx | Main | 1 |
| . | A | yyy | "" | 2 |
| . | A | zzz | "" | 3 |
| . | B | foo | "" | 1 |
| . | B | bar | Main | 2 |
+----+------+-----------------+--------------+---------+
Should result in
+----+------+-----------------+--------------+-----------------------------------------------+
| ID | Name | Field-To-Update | Duplication | Source |
+----+------+-----------------+--------------+-----------------------------------------------+
| . | A | yyy | Main | 1 |
| . | A | yyy | "" | 2 |
| . | A | zzz | "" | 3 (should be updated from a specific source) |
| . | B | bar | "" | 1 |
| . | B | bar | Main | 2 (should be updated from a specific source) |
+----+------+-----------------+--------------+-----------------------------------------------+
Do any of you have an idea how to tackle this? I've tried with multiple queries for a couple of days now without any success.
you could use a update with join
update t
set t.field_to_update = x.field_to_update
from your_table t
inner join ( select name, field_to_update
from your_table
where Duplication <> 'Main') x
) on t.name = x.name
where t.Duplication = 'Main'
Bizarre requirement. You say you are updating to remove duplicates, however, it looks to me like you are creating duplicates.
There are only 2 records for each Name? Try:
UPDATE Table INNER JOIN
(SELECT Name, [Field-To-Update]
FROM Table
WHERE Duplication Is Null) AS Query1 ON
Table.Name = Query1.Name SET Table.[Field-To-Update] = [Query1]![Field-To-Update] WHERE Duplication = "Main";
Name is a reserved word in Access. Should not use reserved words as name for anything.
Darn! Did not see #scaisEdge answer before posting.
I tried the <> "Main" criteria and it did not work which was surprising - no records returned. So I switched to the Is Null parameter.
If you want to pull value from the maximum Source for each Name, then need a query that does that. Review http://allenbrowne.com/subquery-01.html#TopN. Then use that query in the above example as Query1.
I want to select value from table sorted by a certain order.
I have a table called test that looks like this:
| date | code | value |
+----------+-----------+----------+
| 20050104 | 000005.SZ | -6359.19 |
| 20050104 | 600601.SH | -7876.34 |
| 20050104 | 600602.SH | -25693.3 |
| 20050104 | 600651.SH | NULL |
| 20050104 | 600652.SH | -15309.9 |
...
| 20050105 | 000005.SZ | -4276.28 |
| 20050105 | 600601.SH | -3214.56 |
...
| 20170405 | 000005.SZ | 23978.13 |
| 20170405 | 600601.SH | 32212.54 |
Right now I want to select only one date, say date = 20050104, and then sort the data by a certain order (the order that each stock was listed in the stock market).
I have another table called stock_code which stores the correct order:
+---------+-----------+
| code_id | code |
+---------+-----------+
| 1 | 000002.SZ |
| 2 | 000004.SZ |
| 3 | 600656.SH |
| 4 | 600651.SH |
| 5 | 600652.SH |
| 6 | 600653.SH |
| 7 | 600654.SH |
| 8 | 600602.SH |
| 9 | 600601.SH |
| 10 | 000005.SZ |
...
I want to sorted the selected data by stock_code(code_id), but I don't want to use join because it takes too much time. Any thoughts?
I tried to use field but it gives me an error, please tell me how to correct it or give me an even better idea.
select * from test
where date = 20050104 and code in (select code from stock_code order by code)
order by field(code, (select code from stock_code order by code));
Error Code: 1242. Subquery returns more than 1 row
You told us that you don't want to join because it takes too much time, but the following join query is probably the best option here:
SELECT t.*
FROM test t
INNER JOIN stock_code sc
ON t.code = sc.code
WHERE t.date = '20050104'
ORDER BY sc.code_id
If this really runs slowly, then you should check to make sure you have indices setup on the appropriate columns. In this case, indices on the code columns from both tables as well as an index on test.date should be very helpful.
ALTER TABLE test ADD INDEX code_idx (code)
ALTER TABLE test ADD INDEX date_idx (date)
ALTER TABLE code ADD INDEX code_idx (code)
I have a table with 2 Columns, filled with strings
CREATE TABLE [tbl_text]
(
[directoryName] nvarchar(200),
[text1] nvarchar(200),
[text2] nvarchar(200)
)
The Strings are build like the following
| Text1 | Text2 |
|------------|----------|
|tz1 tz3 tz2 | al1 al2 |
| tz1 tz3 | al1 al3 |
| tz2 | al3 |
| tz3 tz2 | al1 al2 |
Now i want to Count how many times the TestN or TextN are resulting in the
| Text1 | al1 | al2 | al3 |
|-------|------|------|------|
| tz1 | 2 | 1 | 1 |
| tz2 | 2 | 2 | 1 |
| tz3 | 3 | 2 | 1 |
i tried solving it with an sql-query like this:
TRANSFORM Count(tt.directoryName) AS Value
SELECT tt.Text1
FROM tbl_text as tt
GROUP BY tt.Text1
PIVOT tt.Text2;
This works fine if i got fields only with one value like the third column (the complete datasource has to be like a one-value-style)
But in my case i'm using the strings for a multiselect...
If i try to conform this query onto a datasource filled with the " " between the values the result is complete messed up
Any suggestions how the query should look like to get this result ?
You'll have to split the strings inside Text1/Text2 before you can do anything with them. In VBA, you'd loop a recordset, use the Split() function and insert the results into a temp table.
In Sql Server there are more powerful options available.
Coming from here: Split function equivalent in T-SQL? ,
you should read this page:
http://www.sommarskog.se/arrays-in-sql-2005.html#tablelists
I've got a a table with rows, and one of the rows has a field with data like this
{"name":"Richard","lastname":null,"city":"Olavarria","cityId":null}
And i want to select all the distinct "city" values i've got. Only using mysql server.
Is it possible? I'm trying with something like this
SELECT id FROM table_name WHERE field_name REGEXP '"key_name":"([^"]*)key_word([^"]*)"';
But i can't make the regexp work
Thanks in advance
MySQL has got support for JSON in version 5.7.7
http://mysqlserverteam.com/json-labs-release-native-json-data-type-and-binary-format/
You will be able to use the jsn_extract function to efficiently parse your JSON string.
If you have an older version and you want to solve it purely in mysql then I am afraid you have to treat it as a string and cut the value out of it (just normal string functions or use regular expressions)
This is not elegant but it will work
http://sqlfiddle.com/#!9/97cfd/14
SELECT
DISTINCT(substring(jsonfield, locate('"city":',jsonfield)+8,
locate('","', jsonfield, locate('"city":',jsonfield))-locate('"city":',jsonfield)-8)
)
FROM
ForgeRock
I have wrapped this into a stored function for those constrained to MySQL <5.7.7:
CREATE FUNCTION `json_extract_string`(
p_json text,
p_key text
) RETURNS varchar(40) CHARSET latin1
BEGIN
SET #pattern = CONCAT('"', p_key, '":"');
SET #start_i = LOCATE(#pattern, p_json) + CHAR_LENGTH(#pattern);
if #start_i = CHAR_LENGTH(#pattern) then
SET #end_i = 0;
else
SET #end_i = LOCATE('"', p_json, #start_i) - #start_i;
end if;
RETURN SUBSTR(p_json, #start_i, #end_i);
END
Note this only works with string values but is a bit more robust than #DmitryK's answer, in that it returns an empty string if the key is not found and the key can be anywhere in the JSON string.
Yes , you can definitely to it using JSON_EXTRACT() function in mysql.
lets take a table that contains JSON (table client_services here) :
+-----+-----------+--------------------------------------+
| id | client_id | service_values |
+-----+-----------+------------+-------------------------+
| 100 | 1000 | { "quota": 1,"data_transfer":160000} |
| 101 | 1000 | { "quota": 2,"data_transfer":800000} |
| 102 | 1000 | { "quota": 3,"data_transfer":70000} |
| 103 | 1001 | { "quota": 1,"data_transfer":97000} |
| 104 | 1001 | { "quota": 2,"data_transfer":1760} |
| 105 | 1002 | { "quota": 2,"data_transfer":1060} |
+-----+-----------+--------------------------------------+
To Select each JSON fields , run this query :
SELECT
id, client_id,
json_extract(service_values, '$.quota') AS quota,
json_extract(service_values, '$.data_transfer') AS data_transfer
FROM client_services;
So the output will be :
+-----+-----------+----------------------+
| id | client_id | quota | data_transfer|
+-----+-----------+----------------------+
| 100 | 1000 | 1 | 160000 |
| 101 | 1000 | 2 | 800000 |
| 102 | 1000 | 3 | 70000 |
| 103 | 1001 | 1 | 97000 |
| 104 | 1001 | 2 | 1760 |
| 105 | 1002 | 2 | 1060 |
+-----+-----------+----------------------+
NOW, if you want lets say DISTINCT quota , then run this query :
SELECT
distinct( JSON_EXTRACT(service_values, '$.quota')) AS quota
FROM client_services;
So this will result into your desired output :
+-------+
| quota |
+-------+
| 1 |
| 2 |
| 3 |
+-------+
hope this helps!
See MariaDB's Dynamic Columns.
Also, search this forum for [mysql] [json]; the topic has been discussed often.
This may be a little late, but the accepted answer didn't work for me. I used SUBSTRING_INDEX to achieve the desired result.
SELECT
ID, SUBSTRING_INDEX(SUBSTRING_INDEX(JSON, '"mykey" : "', -1), '",', 1) MYKEY
FROM MY_TABLE;
Hope this helps.