I have a database as follows
The first column is the name.
The second column bears the number of the son in the family.
The third column is the family Code.
-Explanatory information:
-The first column in the database. Contains the name of the father and children and they are not arranged
-The second column in the database. It contains the number of fathers and children in the database where the parents take nothing and the children take numbers.
-The third column in the database. It contains a code that is specific to each family and does not subscribe to any other family.
What is required when searching in query as follows:
The query is made for a specific name, where the search is for displaying all fields containing the same name if it is for a father or children.
Provided that the final form of the offer is to collect parents only and arrange them in ascending order.
The data in the images is for illustration and the actual column names of the query
If you search for a name, let it be Ali, the result will be as follows 2 image:
2- The final result With the order of the parents in ascending name order.
MY TRY NOT WORK
SELECT PARENT_NAME, PARENT_NUMBER,PARENT_CODE
FROM PARENT_TB
HAVING (((PARENT_NUMBER) Is Null));
Try using a subquery:
SELECT
IIF(PARENT_NUMBER Is Null,
PARENT_NAME,
(Select T.PARENT_NAME
From PARENT_TB As T
Where T.PARENT_CODE = PARENT_TB.PARENT_CODE And T.PARENT_NUMBER Is Null)) As ParentName,
PARENT_CODE
FROM
PARENT_TB
WHERE
PARENT_NUMBER = "Ali"
Related
I have table emails_grouping in that I have one column named 'to_ids' this column contains multiple employee Id's . Now I want to change that Id's with respective employee names. employee data is in employee table.
this is in mysql.
I tried multiple ways but I'm not able to replace id's with names because , that 'to_ids' column contains multiple 'Ids'.
description to_ids
'Inactive Employees with missing Last working day', '11041,11109,899,13375,1715,1026'
above is the column which I want to change Id's with employee names.
This problem should demonstrate to you why it's a bad idea to store "lists" of id's like you're doing. You should instead store one id per row.
You can join to your employee table like this:
SELECT e.name
FROM emails_grouping AS g
JOIN employee AS e
ON FIND_IN_SET(e.id, g.to_ids)
WHERE g.description = 'Inactive Employees with missing Last working day';
But be aware that joining using a function like this is not possible to optimize. It will have very slow performance, because it can't look up the respective employee id's using an index. It has to do a table-scan of the employee table, and evaluate the id's against your comma-separated list one by one.
This is just one reason why using comma-separated lists instead of normal columns is trouble. See my answer to Is storing a delimited list in a database column really that bad?
There is a table in our database that contains customer information including their first and last name. The first and last name are stored as separate fields and not together as one name. There is also a table which stores a referral field. In this field, someone can place the name of the customer that referred them to our services.
I would like to utilize a query that will take the referral field (which would contain the name of a prior customer) and match it up to the record to that prior customer.
I thought the below would work:
SELECT APPLICATION_ID
FROM APPLICATION_TABLE
JOIN APPU_USER ON APPU_APPLICATION_ID = APPLICATION_ID
LEFT JOIN APBD_APP_BASIC_DATA ON APBD_APPLICATION_ID = APPLICATION_ID
WHERE CONCAT(APPU_FIRST_NAME,' ',APPU_LAST_NAME) = APBD_REFERRAL_STRING;
What do I need to utilize to be able to do this?
everything looks fine in your query. Is a good practice to put the table names when you use two or more tables in a query to avoid same fields conflicts, something like:
LEFT JOIN APBD_APP_BASIC_DATA ON APBD_APP_BASIC_DATA.APBD_APPLICATION_ID = APPLICATION_TABLE.APPLICATION_ID
also, take in mind than
CONCAT(APPU_FIRST_NAME,' ',APPU_LAST_NAME) = APBD_REFERRAL_STRING;
can cause problems if referral string is in format last name,first name or first name, last name, or with 2 spaces
I want to perform a query whereby I want to check whether on the columns A has either certain values. A could have only X , X and Y or a combination of X Y and Z.
To give a better understanding. I am checking a book's author within a table itself. The table has the BOOK_ID , BOOK_TITLE , AUTHOR_NAME, AUTHOR_ORDER.
So a book might have 1,2 or 3 authors, listed in order written inside the AUTHOR_ORDER row. I am trying very hard to reach an output where if a book has 3 authors, it will display accordingly from the first author to the third author. I am now stuck in the part where I need to compare the value and present it in the output.
Any idea how to achieve this in MYSQL output?
Sample :
The output result is more or less like this:
If the title has au_ord of 1,2 and 3, there shall be a new column with all the authors name listed in ascending.
So for example, for title BU1032, the Author row will be Bennet, Green
I think GROUP_CONCAT is what you are after:
SELECT Title_ID,
Title,
GROUP_CONCAT(au_LName ORDER BY au_Ord) AS Authors
FROM Books
GROUP BY Title_ID, Title;
SQL FIDDLE
This is for a homework assignment. I haven't copy-pasted the question below, I made an simpler version of it that focuses on the specific area where I'm stuck.
Let's say I have a table of two values: a person's name, and the place he had lunch yesterday. Assume everyone has lunch in pairs. How can I query the database to return all the pairs of people that had lunch together yesterday? Each pair must be only listed once.
I'm actually not even sure what the professor means by return them as pairs. I've sent him an email, but no reply yet. It seems like he wants me to write a query that returns a table with column 1 as person 1 and column 2 as person 2.
Any suggestions on how to go about this? Does it seem right to assume he wants them as separate columns?
So far, I basically have:
SELECT name, restaurant FROM lunches GROUP BY restaurant, name
which essentially just reorganizes the table so that the people who had lunch together are one after the other.
We have to assume there can be only one pair eating lunch in a given restaurant.
You can get a list of pairs either using self-join:
SELECT l1.name, l2.name FROM lunches l1
JOIN lunches l2
ON l1.restaurant = l2.restaurant AND l1.name < l2.name
or using GROUP BY:
SELECT GROUP_CONCAT(name) FROM lunches
GROUP BY restaurant
The first query will return pairs in two different columns, while the second in one column, using comma as separator (default for GROUP_CONCAT, you can change it to whatever you wish).
Also note that for the first query names in pairs will come in alphabetical order as we use < instead of <> to avoid listing each pair twice.
I don't think this is a duplicate posting because I've looked around and this seems a bit more specific than whats already been asked (but I could be wrong).
I have 4 tables and one of them is just a lookup table
SELECT exercises.id as exid, name, sets, reps, type, movement, categories.id
FROM exercises
INNER JOIN exercisecategory ON exercises.id = exerciseid
INNER JOIN categories ON categoryid = categories.id
INNER JOIN workoutcategory ON workoutid = workoutcategory.id
WHERE (workoutcategory.id = '$workouttypeid')
AND rand_id > UNIX_TIMESTAMP()
ORDER BY rand_id ASC LIMIT 6;
exercises table contains a list of exercise names, sets, reps, and an id
categories table contains an id, musclegroup, and type of movement
workoutcategory table contains an id, and a more specific motion (ie: upper body push, or upper body pull)
exercisecategory table is the lookup table that contains (and matches the id's) for exerciseid, categoryid, and workoutid
I've also added a column to the exercises table that generates a random number upon entering the row in the database. This number is then updated only for the specified category when it is called, and then sorted and displays the ascending order of the top 6 listings. This generates a nice random entry for me. (Found that solution elsewhere here on SO).
This works fine for generating 6 random exercises from a specific top level category. But I'd like to drill down further. Here's an example...
select all rows inside categoryid 4
then still within the category 4 results, find all that have movementid 2, and then find one entry with a typeid 1, then another for typeid 2, etc
TLDR; Basically there's a few levels of categories and I'm looking to select a few from here and a few from there and they're all within this top level. I'm thinking this could all be executed within more than one query but im not sure how... in the end I'm looking to end with one array of the randomized entries.
Sorry for the long read, its the best explanation I've got.
Just realized I never came back to this posting...
I ended up using several mysql queries within a switch based on what is needed during the request. Worked out perfectly.