I have field that has value kind of store878 . I would like to have 878 from select statement. How do I get that numbers from select statement
select
store,
address
from
detail,
store_number
where
store (here i would like to have number) = store_mumber.id
I haven't tested this to make sure is works:
SELECT store, address
FROM detail d
INNER JOIN store_number s
ON CAST(SUBSTRING(d.store, LOCATE('%[0-9]%', d.store)) AS int) = s.id
But you should really consider changing the structure of your database.
Related
what if I have two strings: "123" and "abc". I want to select username if there's username "123" then choose it, if not found (null) then select username where "abc"
I have a table called USERS, this table responsibility with workflow engine account. I want to show columns in USERS:
username
email
usr_firstname
usr_lastname
I am using concat to merge column 3 and 4 with space between it. In the office, there are 2 types of employee:
origin/internal employee
outsource/partner employee
Origin employee login into every system using LDAP (FirstName.LastName), but outsource or partner employee login individually just for our workflow engine using employee identity number.
In this case, if I use something like:
Where username = 'employeenumber' or username = 'LDAPacc' the result is both account (used and unused for outsource) they appear. I want to show just 1 rows and 1 query but it's work with internal or even outsource (they will got data correctly for outsource).
You can use like this query;
SELECT *
FROM TABLE
WHERE username IN ('123', 'abc')
AND (username='123' OR NOT EXISTS(SELECT * FROM TABLE WHERE username='abc'))
You could use COALESCE.
COALESCE selects the first non null value out of the ones supplied.
So you could use....
SELECT COALESCE(String_123, string_ABC);
If string_123 has a value it will select that, otherwise it will select string_ABC unless of course they are both null.
So to be safe include a default value.......
SELECT COALESCE(String_123, string_ABC, string_Default);
I've found when I tested my logic to mysql tryit editor by w3schools and It's worked properly what I need. Here's my query:
SELECT * FROM Customers WHERE CustomerID = 'zz' OR (NOT EXISTS (SELECT * FROM Customers WHERE CustomerID = 'zz') AND CustomerID = '3')
let's say CustomerID is equivalent to my username column, then I tried to swap 'zz' and '3' value and it's still works. I hope there's more simple query than this
I have 3 tables that I am using and need to make a query to return data from one table based on the value of a single column in the second table.
tbl_user
ID
login
pass
active
mscID
tbl_master
ID
name
training_date
MSCUnit
Active
tbl_msc
mscID
mscName
my current SQL statement:
SELECT
tbl_master.ID,
tbl_master.name,
tbl_master.training_date,
tbl_master.MSCUnit,
tbl_master.active,
tbl_user.mscID
FROM
tbl_master,
tbl_user
WHERE
tbl_master.active = 1 AND tbl_master.MSCUnit = tbl_user.mscID
The values stored in tbl_msc.mscID is a varchar(11) and it contains a string similar to A00 or A19. This is also the Primary key in the table.
The values stored in tbl_user.mscID matches that of tbl_msc.mscID. The values stored in tbl_master.UnitMSC also matches that of tbl_msc.mscID.
My goal is to return all records from tbl_master where the currently logged in user has the same mscID. The problem I am having is the statement returns all records in tbl_master.
I have tried several different join statements and for some reason, I cannot get this to filter correctly.
I am missing something. Any assistance in the SQL statement would be appreciated.
Thanks,
Will
You should be writing this using joins. I don't know how you know who the current user is, but the idea is to join the three tables together:
SELECT m.ID, m.name, m.training_date, m.MSCUnit, m.active,
u.mscID
FROM tbl_master m JOIN
tbl_user u
ON m.MSCUnit = u.mscID JOIN
tbl_msc msc
ON msc.mscID = u.msc_ID
WHERE m.active = 1 AND msc.mscName = ?;
Notice the use of proper, explicit, standard JOIN syntax and table aliases.
Select a.*, b.userid from
table_master a, table_user b where
a.mscunit in (select mscid from
table_user where active=1)
This should point you in the right direction.
Okay so I have two tables:
hscust and hssales_rep
I need to create a view that shows me the reps fname and lname (as well as the customers) and show how much the customer is over on there credit balance.
This is the code I have:
CREATE VIEW OverLimit AS
SELECT
CONCAT(hssales_rep.last,hssales_rep.first) AS Rep,
CONCAT(hscust.last,hscust.first) AS Cust,
SUM(credit_limit - balance)
FROM hscust
INNER JOIN hssales_rep ON hscust.sales_rep = hssales_rep.repid
And it returns an empty result.
Any help is greatly appreciated!
salesrep table
cust table
A CREATE VIEW statement doesn't return a resultset.
A SELECT statement can return an empty resultset. But we'd expect the SELECT statement in your view definition to return either a single row, or throw an error.
I suggest you break this down a bit.
1) What problem is being solved by the CREATE VIEW statement. Why do you need a view?
2) Before you write a CREATE VIEW statement, first develop and test a SELECT statement that returns the required resultset. Do that before you put that into a view definition.
I also strongly recommend that you qualify all column references in the SELECT statement either with the table name or (preferably) a short table alias.
If you want to return a row for each Cust with an aggregate function (e.g. SUM) in your SELECT list, then add an appropriate GROUP BY clause to your SELECT statement.
It's not clear why we would want to use a SUM aggregate function.
The difference between "credit_limit" and "balance" would be the available (remaining) credit. A negative value would indicate the balance was "over" the credit limit.
SELECT CONCAT(r.last,r.first) AS Rep
, CONCAT(c.last,c.first) AS Cust
, c.credit_limit - c.balance AS available_credit
FROM hscust c
JOIN hssales_rep r
ON c.sales_rep=r.repid
ORDER
BY CONCAT(r.last,r.first)
, CONCAT(c.last,c.first)
, c.custid
If we only want to return rows for customers that are "over" their credit limit, we can add a WHERE clause.
SELECT CONCAT(r.last,r.first) AS Rep
, CONCAT(c.last,c.first) AS Cust
, c.credit_limit - c.balance AS available_credit
FROM hscust c
JOIN hssales_rep r
ON c.sales_rep=r.repid
WHERE c.credit_limit - c.balance < 0
ORDER
BY CONCAT(r.last,r.first)
, CONCAT(c.last,c.first)
, c.custid
Again, get a SELECT statement working (returning the required resultset) before you wrap it in a CREATE VIEW.
I have a "users" table with an "assignments" field that has a list of course IDs and when then are assigned and whether they are required or optional in one json-like string (missing the top-level braces)
"BUS1077":{"startDate":"2013-09-16","hasPrerequisite":"","list":"required"},
"CMP1042":{"startDate":"2013-09-16","hasPrerequisite":"","list":"optional"},
"CMP1108":{"startDate":"2013-09-16","hasPrerequisite":"","list":"required"}
I have a another table, called "progress" that lists the course ids, like BUS1078, and whether they are completed or not.
I need a query to select the users who have completed all their required courses.
somthing like:
SELECT userid FROM users
where (count([ids from users.assignments where list:"required"] as courseid)
=count([extracted ids] joined using( courseid) where "complete"=1))
so there are just two tables
users (userid,assignments)
progress (id,userid,courseid,complete)
in the end I want to have selected the userids where each REQUIRED course is complete
(note, the database itself is much more complex, but this represents the gist of the problem)
As of MySQL 5.1 you can do this with built-in functions of common_schema you can use for this purpose. I haven't used it myself but I've found a nice blog about how you can parse JSON stored data and do something usefull with it.
The blog: http://mechanics.flite.com/blog/2013/04/08/json-parsing-in-mysql-using-common-schema/
I'm not familiar with the RegEx implementation in MySQL, but this basic approach should work:
SELECT userid FROM users WHERE NOT EXISTS(
SELECT NULL FROM assignments WHERE NOT EXISTS(
SELECT NULL FROM progress WHERE
progress.userid = users.userid
AND REGEXMATCH(
assignments.assignment,
'(^|,)"' + progress.courseid + '":.*?"list":"required"\}') >= 0
)
)
)
This should find all users where there is not a required assignment that the user hasn't completed.
Given the course IDs and the word "required" are unlikely to appear out of context, the regular expression itself could likely be much more naive, such as:
'"' + progress.courseid + '"[^}]+"required"'
I don't know about MySQL's current limitations when it comes to correlated subqueries, but the same thing could be accomplished with joins. Using EXISTS should be preferred over COUNT, since counting requires aggregation across the entire dataset rather than allowing a short-cut on the first non-match found.
if your courseid is always 7 characters long and the list in assignments field can have up to maximum of 10 courses
you can use this sqlFiddle
SELECT U.userId
FROM users U
WHERE NOT EXISTS
(SELECT 1 FROM
(SELECT users.userid,courseName,
(Assignments REGEXP CONCAT('"',courseName,'"[^}]+(:"required"})'))as Required,
Assignments,
courseid,complete
FROM
(SELECT userid,courseName FROM
(SELECT userid,SUBSTRING_INDEX(SUBSTRING_INDEX(assignments,'":{"startDate',course.num),'"',-1) as courseName
FROM users,(SELECT 1 as num
UNION SELECT 2
UNION SELECT 3
UNION SELECT 4
UNION SELECT 5
UNION SELECT 6
UNION SELECT 7
UNION SELECT 8
UNION SELECT 9
UNION SELECT 10)course
)T WHERE LENGTH(courseName)=7
)Courses
INNER JOIN users ON users.userid = Courses.userid
LEFT JOIN progress ON users.userid = progress.userid
AND Courses.courseName = progress.courseId
AND progress.complete = 1
)AllCourses
WHERE AllCourses.userId = U.userId
AND AllCourses.Required = 1
AND Complete IS NULL
)
What the query does is it grabs the courseName(s) from assignment fields and see if it's required and sets required flag, then LEFT JOIN with progress and we have the Required column and Complete is NULL when the course doesn't exist in progress or when complete is not 1.
We then select user id WHERE there does not EXISTS (a record in their Courses where Required = 1 AND Complete IS NULL)
In the fiddle, I have user 2 having only completed an optional course. So userId 2 is not returned.
You can just run the inner select for AllCourses subquery and see the data of all the courses for all users and whether they completed a course that is required or not.
I want to add some dynamic content in from clause based on one particular column value.
is it possible?
For Example,
SELECT BILL.BILL_NO AS BILLNO,
IF(BILL.PATIENT_ID IS NULL,"CUS.CUSTOMERNAME AS NAME","PAT.PATIENTNAME AS NAME")
FROM
BILL_PATIENT_BILL AS BILL
LEFT JOIN IF(BILL.PATIENT_ID IS NULL," RT_TICKET_CUSTOMER AS CUS ON BILL.CUSTOMER_ID=CUS.ID"," RT_TICKET_PATIENT AS PAT ON BILL.PATIENT_ID=PAT.ID")
But This query is not working.
Here
BILL_PATIENT_BILL table is a common table.
It can have either PATIENT_ID or CUSTOMER_ID. If a particular record has PATIENT_ID i want PATIENTNAME in RT_TICKET_PATIENT as NAME OtherWise it will hold CUSTOMER_ID. If it is i want CUSTOMERNAME as NAME.
Here I m sure That BILL_PATIENT_BILL must have either PATIENT_ID or CUSTOMER_ID.
Can anyone help me?
You can also use IF() to select the right values instead of constructing your query from strings:
SELECT
BILL.BILL_NO AS BILLNO,
IF( BILL.PATIENT_ID IS NULL, cus.CUSTOMERNAME, pat.PATIENTNAME ) AS NAME
FROM
BILL_PATIENT_BILL AS BILL
LEFT JOIN RT_TICKET_CUSTOMER cus ON BILL.CUSTOMER_ID = cus.ID
LEFT JOIN RT_TICKET_PATIENT pat ON BILL.PATIENT_ID = pat.ID
However, it would also be possible to PREPARE a statement from strings and EXECUTE it but this technique is prone to SQL injections, i can only disadvise to do so:
read here: Is it possible to execute a string in MySQL?