I am new to databases. In mysql database I have one table course. My question is: how to search all related words in both columns course_name and course_description and i need to get all the matched words in both columns? Can any one tell me the sql query for it? I have tried to write a query, but I am getting some syntax errors.
+----------+-----------+-----------------+------------+------------+
| courseId | cname | cdesc | sdate | edate |
+----------+-----------+-----------------+------------+------------+
| 301 | physics | science | 2013-01-03 | 2013-01-06 |
| 303 | chemistry | science | 2013-01-09 | 2013-01-09 |
| 402 | afm | finanace | 2013-01-18 | 2013-01-25 |
| 403 | English | language | 2013-01-17 | 2013-01-24 |
| 404 | Telugu | spoken language | 2013-01-10 | 2013-01-22 |
+----------+-----------+-----------------+------------+------------+
SELECT * from course WHERE cname='%searchtermhere%' AND cdesc='%searchtermhere%'
Adding the percent % makes the search within each value and not just beginning with.
If you want to search exact word
SELECT * FROM course WHERE cname ='word' AND cdesc = 'word'
OR you can also find each value and not just start from begining.
SELECT * FROM course WHERE cname = '".%searchtermhere%."' AND cdesc = '".%searchtermhere%."'
Since you say single parameter i guess. You will get either 'science' as input or 'physics' as input. Then you could simply use 'OR'.
select * from course where cname = (Input) or cdesc = (Input)
Related
I am using the PATSTAT database to select the APPLN_ID of patent applications that have a cpc classification symbol but not another. I need to do this in order to retrieve a control dataset of patents to verify my hypothesis.
PATSTAT is a relational database where each patent application has a set of attributes. The TLS224 table contains multiple rows with the same APPLN_ID and different CPC symbols. I want to retrieve the APPLN_IDs that have a set of symbols A but that do not have a set of symbols B.
From this example data
| APPLN_ID | CPC_CLASS_SYMBOL |
| 2345 | C07K 16/26 |
| 2345 | C07K2317/34 |
| 2345 | C07K2317/76 |
| 2345 | G01N 33/74 |
| 2345 | B01L 9/527 |
| 1000 | C07K2317/34 |
| 1000 | C07K 16/26 |
| 1000 | C07K2317/76 |
| 1000 | B01L 3/5025 |
| 9999 | B01L 3/5025 |
| 9999 | G01N2333/47 |
| 9999 | G01N2333/4727 |
I want to obtain this as a result.
| APPLN_ID |
| 1000 |
Here, the set of values A that must be included are 'C07K 16/26' ,'C07K2317/34', 'C07K2317/76', while the value B that must NOT be present is G01N 33/74.
How can I do that?
This is what I came out with so far (I know that the WHERE IN and NOT IN clauses nullify each other, but it is just to show an example).
SELECT DISTINCT p2.APPLN_ID
FROM (SELECT p1.APPLN_ID, p1.PUBLN_AUTH, YEAR(p1.PUBLN_DATE)
FROM TLS211_PAT_PUBLN p1
WHERE YEAR(p1.PUBLN_DATE) = 2008
AND PUBLN_AUTH = 'WO') p2
JOIN (SELECT DISTINCT cpc3.APPLN_ID
FROM TLS224_APPLN_CPC cpc3
WHERE cpc3.APPLN_ID IN
(SELECT APPLN_ID
FROM TLS224_APPLN_CPC
WHERE CPC_CLASS_SYMBOL NOT IN ('G01N 33/74'))
AND cpc3.APPLN_ID IN
(SELECT APPLN_ID
FROM TLS224_APPLN_CPC
WHERE CPC_CLASS_SYMBOL IN ('C07K 16/26', 'C07K2317/34', 'C07K2317/76'))
) cpc1
ON cpc1.APPLN_ID = p2.APPLN_ID
I am still a newbie to SQL so any help is appreciated!
Thank you
your IN and NOT IN doesn't make sense.
if CPC_CLASS_SYMBOL are in the first Group they are automatocally NOT IN your second
Your WHERE clause would only give you APPLN_ID (and some more) the have these symbols and everything else is excluded.
I have this table
| BookID | BookTitle | NumberOfPages | NoOfCopies |
+--------+--------------------------------+---------------+------------+
| 1 | The Help | 444 | 4 |
| 2 | The Catcher in the Rye | 277 | 10 |
| 3 | Crime and Punishment | 545 | 2 |
| 4 | The Brothers Karamazov | 795 | 1 |
| 5 | A Crown of Wishes | 369 | 12 |
| 6 | The Fireman | 752 | 3 |
| 7 | Fahrenheit 451 | 174 | 9 |
| 8 | The Hobbit | 366 | 1 |
| 9 | Lord of Emperors | 560 | 4 |
| 10 | Holy Bible: King James Version | 1590 | 11 |
----------------------------------------------------------------------------
When I insert a book title and expect it to return the book id, it always returns an empty set
so far, I have tried these queries.->book_info is the name of the table:
select BookID from book_info where ucase(BookTitle) = ' THE HELP% ';
select BookID from book_info where BookTitle = ' The Help ';
select BookID from book_info where lcase(trim(BookTitle) = 'the help';
but none of them worked.
Note I don't rely on sql in my job.
you need to use like if you want to use "%"
when you use "=" you need to sure it is same. even space also count
select BookID from book_info where BookTitle LIKE 'THE HELP%';
The issue here is with the operator you are using and the value you are function you are expecting from it, = operator checks for the exact match that's why your queries are returning no records:
select BookID from book_info where ucase(BookTitle) = ' THE HELP% ';
select BookID from book_info where BookTitle = ' The Help ';
select BookID from book_info where lcase(trim(BookTitle) = 'the help';
And one more thing that is:
MySQL queries are not case-sensitive by default.
So you don't need to add the string methods here to change the values case.
We usually use the % with LIKE only like this:
select BookID from book_info where ucase(BookTitle) LIKE '%THE HELP%';
In this query LIKE %THE HELP% will match all the string having THE HELP in them;
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.
I am looking for a fastest way to insert data into database.
Currently I have 2 tables which is "User" and "User_Detail".
One "User" can has many "User_detail"
Example:
In database,we have the record of Age and mail for user "John".
User table
|Name |
|---------|
| John |
| Jason |
| Wilson |
User_Detail table
| Usr_Name| Property | Value |
|---------+----------+--------|
| John | Age | 12 |
| John | mail | gmail |
| Wilson | Age | 31 |
I would like to write a query to add "uni" to ALL of the users.
The result will become like this.
User_Detail table
| Usr_Name | Property | Value |
|----------+----------+--------|
| John | Age | 12 |
| John | mail | gmail |
| John | Uni | 00000 |
| Wilson | Age | 31 |
| Wilson | Uni | 00000 |
| Jason | Uni | 00000 |
Is there any suggestions or ideas on how to insert data ?
I need the fastest way to do it, as I have around 10k users in my USER table.
It can be any language or database query, as long as it can be very fast to insert the record to database.
First, consider normalizing your schema. Here is an in-depth discussion of EAV storage on dba.SE.
With your given design, this does the job:
INSERT INTO "User_Detail" ("Usr_Name", "Property", "Value")
SELECT "Name", 'Uni', '0000'
FROM "User";
In Postgres, I would also advise not to use mixed-case identifiers.
To insert a value in, just do a simple insert query.
INSERT INTO `User_detail` (`User_name`, 'Property`, `Value')
SELECT `Name`, 'H/P', 50012 FROM `Users`
To make the inserted value be something different, you need to change that hard coded value 50012 to something that resolves to the number you want there.
I have table named questions like follows
+----+---------------------------------------------------------+----------+
| id | title | category |
+----+---------------------------------------------------------+----------+
| 89 | Tinker or work with your hands? | 2 |
| 54 | Sketch, draw, paint? | 3 |
| 53 | Express yourself clearly? | 4 |
| 77 | Keep accurate records? | 6 |
| 32 | Efficient? | 6 |
| 52 | Make original crafts, dinners, school or work projects? | 3 |
| 70 | Be elected to office or make your opinions heard? | 5 |
| 78 | Take photographs? | 3 |
| 84 | Start your own political campaign? | 5 |
| 9 | Free spirit or a rebel? | 3 |
| 38 | Lead a group? | 5 |
| 71 | Work in groups? | 4 |
| 2 | Helpful? | 4 |
| 4 | Mechanical? | 6 |
| 14 | Responsible? | 6 |
| 66 | Pitch a tent, an idea? | 1 |
| 62 | Write useful business letters? | 5 |
| 28 | Creative? | 3 |
| 68 | Perform experiments? | 2 |
| 10 | Like to figure things out? | 2 |
+----+---------------------------------------------------------+----------+
I have a sql query to get one random record from each category.Can any one convert the mysql query to rails activerecord query(with out using Question.find_by_sql).This mysql query is working absolutely fine but I need only active record query because of my dependency in further steps.
Here is mysql query
SELECT t.id, title as question, category
FROM
(
SELECT
(
SELECT id
FROM questions
WHERE category = t.category
ORDER BY RAND()
LIMIT 1
) id
FROM questions t
GROUP BY category
) q JOIN questions t
ON q.id = t.id
Thank You for your consideration!
When things get crazy one have to reach out for Arel:
It is intended to be a framework framework; that is, you can build
your own ORM with it, focusing on innovative object and collection
modeling as opposed to database compatibility and query generation.
So what we want to do is to let Arel create the query for us. Moreover the approach here is gonna be used: the questions table is left joined with randomized version of itself:
q_normal = Arel::Table.new("questions")
q_random = Arel::Table.new("questions").project(Arel.sql("*")).order("RAND()").as("q2")
Time to left join
query = q_normal.join(q_random, Arel::Nodes::OuterJoin).on(q_normal[:category].eq(q_random[:category])).group(q_normal[:category]).order(q_random[:category])
Now you can use which columns you want using project, e.g.:
query.project(q_normal[:id])
The only way I can think of to do this requires a good bit of application code. I don't think there's a way of accessing the RAND() functionality in MySQL (or equivalent in other DB technologies) using ActiveRecord. Here's what I came up with:
counts = Question.group(:category_id).count(:id)
offsets = {}
counts.each do |cat_id, count|
offsets[cat_id] = rand(count)
end
random_questions = []
offsets.each do |cat_id, offset|
random_questions.push(Question.where(:category_id => cat_id).offset(offset).first)
end