Currently I have some existing tables about user action and user info and their associated meta info:
action table:
user_id, action_detail
1 "action_click"
2 "action_drag"
user info tablle
user_id, full_name, email
1 "User One" "userone#user.com"
1 "User Two" "usertwo#user2.com"
company info table
company_name, company_domain
"User Company" "user.com"
"User2 Company" "user2.com"
The new requirement I got is:
Building queries that can find all the actions of:
all users from a single company
a single company but exclude certain users specified
multiple companies together but exclude certain users specified
Could anyone give some thoughts about it( especially what is the efficient way to do 2 and 3)?
Requirement #2 is a subset of requirement #3 (a single company is just a list of companies with the size of one). You could use the exists operator to find users under the companies domain, and exclude users based on other conditions:
SELECT *
FROM user u
WHERE full_name NOT IN ('John Doe', 'Jane Doe' /* or any other condition */) AND
EXISTS (SELECT *
FROM company c
WHERE c.company_name NOT IN ('company1', 'company2', /* etc. */) AND
u.email LIKE '%#' || c.company_domain)
EDIT:
To address the conversation in the comments, if you have a large number of ignored users, you may want to have an auxiliary table of ignored users so you can index them and make the search faster.
E.g.:
CREATE TABLE ignored_users (
full_name VARCHAR PRIMARY KEY
);
INSERT INTO ignored_users VALUES ('John Doe');
-- A bunch of other inserts...
SELECT *
FROM user u
WHERE full_name NOT IN (SELECT full_name FROM ignored_users) AND
EXISTS (SELECT *
FROM company c
WHERE c.company_name NOT IN ('company1', 'company2', /* etc. */) AND
u.email LIKE '%#' || c.company_domain)
Related
I have two tables.
One user table containing the user_id, user_email, user_name
and other user_status table containing user_email, status.
The issue I am facing is the user_status table is newly added and it is empty. The user table is already in the production. I want to achieve a scenario where I can add the rows in the status table without cleaning the db.
If the user_name is empty, then the status in the user_status table would be offline otherwise online.
user_id user_email user_name
1 xyz#gmail.com xyz
2 abc#gmail.com
If this is my user table and my user_status table is empty, then I want to update the user_status table as:
user_email status
xyz#gmail.com active
abc#gmail.com inactive
Use insert ...select and a conditional expression:
insert into user_status(user_email, status)
select user_email, case when user_name is null then 'offline' else 'online' end
from users
This assumes that by "empty" you mean null. If you really mean empty string, then the condition in the case should be where user_name = '' instead.
Note that user is a language keyword in almost all databases, hence not a good choice for a column name. I renamed it to users in the query.
I have 2 tables SQL:
USER with columns ->: uid, name, mail
Phone ->: id, brand, model, refFirtUser
refFirtUser is a column that constitutes the user's id - and a random number
example : refFirtUser (uid_users-12345687) -> 9145-12345687
i want to delete in table "Phone" all data .
I must to get "uid" of user by mail and to search N first characters before "-".
all data in column "refFirtUser " starting with "uid-xxxxx"
(where uid is the id of the user).
the only data I have is email
How should I do?
If you want to delete the from phone the user with mail 'someone#gmail.com':
delete from phone
where
refFirtUser like (select uid from user where mail = 'someone#gmail.com') || '-%'
It is ambiguous from your explanation whether user.uid is the number before - or after. In either case, you may use exists
delete from phone p
where exists ( select 1 from user u where mail in ( 'listofmail')
and p.refFirtUser like '%-'||u.id );
OR
delete from phone p
where exists ( select 1 from user u where mail in ( 'listofmail')
and p.refFirtUser like u.id||'-%' );
I have DB2 table "organization" which holds organizations data including the following columns
organization_id (PK), name, description
Some organizations are deleted so lot of "organization_id" (i.e. rows) doesn't exist anymore so it is not continuous like 1,2,3,4,5... but more like 1, 2, 5, 7, 11,12,21....
Then there is another table "title" with some other data, and there is organization_id from organization table in it as FK.
Now there is some data which I have to insert for all organizations, some title it is going to be shown for all of them in web app.
In total there is approximately 3000 records to be added.
If I would do it one by one it would look like this:
INSERT INTO title
(
name,
organization_id,
datetime_added,
added_by,
special_fl,
title_type_id
)
VALUES
(
'This is new title',
XXXX,
CURRENT TIMESTAMP,
1,
1,
1
);
where XXXX represent "organization_id" which I should get from table "organization" so that insert do it only for existing organization_id.
So only "organization_id" is changing matching to "organization_id" from table "organization".
What would be best way to do it?
I checked several similar qustions but none of them seems to be equal to this?
SQL Server 2008 Insert with WHILE LOOP
While loop answer interates over continuous IDs, other answer also assumes that ID is autoincremented.
Same here:
How to use a SQL for loop to insert rows into database?
Not sure about this one (as question itself is not quite clear)
Inserting a multiple records in a table with while loop
Any advice on this? How should I do it?
If you seriously want a row for every organization record in Title with the exact same data something like this should work:
INSERT INTO title
(
name,
organization_id,
datetime_added,
added_by,
special_fl,
title_type_id
)
SELECT
'This is new title' as name,
o.organization_id,
CURRENT TIMESTAMP as datetime_added,
1 as added_by,
1 as special_fl,
1 as title_type_id
FROM
organizations o
;
you shouldn't need the column aliases in the select but I am including for readability and good measure.
https://www.ibm.com/support/knowledgecenter/ssw_i5_54/sqlp/rbafymultrow.htm
and for good measure in case you process errors out or whatever... you can also do something like this to only insert a record in title if that organization_id and title does not exist.
INSERT INTO title
(
name,
organization_id,
datetime_added,
added_by,
special_fl,
title_type_id
)
SELECT
'This is new title' as name,
o.organization_id,
CURRENT TIMESTAMP as datetime_added,
1 as added_by,
1 as special_fl,
1 as title_type_id
FROM
organizations o
LEFT JOIN Title t
ON o.organization_id = t.organization_id
AND t.name = 'This is new title'
WHERE
t.organization_id IS NULL
;
I have my database structure like this ::
Database structure ::
ATT_table- ActID(PK), assignedtoID(FK), assignedbyID(FK), Env_ID(FK), Product_ID(FK), project_ID(FK), Status
Product_table - Product_ID(PK), Product_name
Project_Table- Project_ID(PK), Project_Name
Environment_Table- Env_ID(PK), Env_Name
Employee_Table- Employee_ID(PK), Name
Employee_Product_projectMapping_Table -Emp_ID(FK), Project_ID(FK), Product_ID(FK)
Product_EnvMapping_Table - Product_ID(FK), Env_ID(FK)
I want to insert values in ATT_Table. Now in that table I have some columns like assignedtoID, assignedbyID, envID, ProductID, project_ID which are FK in this table but primary key in other tables they are simply numbers).
Now when I am inputting data from the user I am taking that in form of string like a user enters Name (Employee_Table), product_Name (Product_table) and not ID directly. So I want to first let the user enter the name (of Employee or product or Project or Env) and then value of its primary key (Emp_ID, product_ID, project_ID, Env_ID) are picked up and then they are inserted into ATT_table in place of assignedtoID, assignedbyID, envID, ProductID, project_ID.
Please note that assignedtoID, assignedbyID are referenced from Emp_ID in Employee_Table.
How to do this ? I have got something like this but its not working ::
INSERT INTO ATT_TABLE(Assigned_To_ID,Assigned_By_ID,Env_ID,Product_ID,Project_ID)
VALUES (A, B, Env_Table.Env_ID, Product_Table.Product_ID, Project_Table.Project_ID)
SELECT Employee_Table.Emp_ID AS A,Employee_Table.Emp_ID AS B, Env_Table.Env_ID, Project_Table.Project_ID, Product_Table.Product_ID
FROM Employee_Table, Env_Table, Product_Table, Project_Table
WHERE Employee_Table.F_Name= "Shantanu" or Employee_Table.F_Name= "Kapil" or Env_Table.Env_Name= "SAT11A" or Product_Table.Product_Name = "ABC" or Project_Table.Project_Name = "Project1";
The way this is handled is by using drop down select lists. The list consists of (at least) two columns: one holds the Id's teh database works with, the other(s) store the strings the user sees. Like
1, "CA", "Canada"
2, "USA", 'United States"
...
The user sees
CA | Canada
USA| United States
...
The value that gets stored in the database is 1, 2, ... whatever row the user selected.
You can never rely on the exact, correct input of users. Sooner or later they will make typo's.
I extend my answer, based on your remark.
The problem with the given solution (get the Id's from the parent tables by JOINing all those parent tables together by the entered text and combining those with a number of AND's) is that as soon as one given parameter has a typo, you will get not a single record back. Imagine the consequences when the real F_name of the employee is "Shant*anu*" and the user entered "Shant*aun*".
The best way to cope with this is to get those Id's one by one from the parent tables. Suppose some FK's have a NOT NULL constraint. You can check if the F_name is filled in and inform the user when he didn't fill that field. Suppose the user eneterd "Shant*aun*" as name, the program will not warn the user, as something is filled in. But that is not the check the database will do, because the NOT NULL constraints are defined on the Id's (FK). When you get the Id's one by one from the parent tables. You can verify if they are NOT NULL or not. When the text is filled in, like "Shant*aun*", but the returned Id is NULL, you can inform the user of a problem and let him correct his input: "No employee by the name 'Shantaun' could be found."
SELECT $Emp_ID_A = Emp_ID
FROM Employee_Table
WHERE F_Name= "Shantanu"
SELECT $Emp_ID_B = Emp_ID
FROM Employee_Table
WHERE B.F_Name= "Kapil"
SELECT $Env_ID = Env_ID
FROM Env_Table
WHERE Env_Table.Env_Name= "SAT11A"
SELECT $Product_ID = Product_ID
FROM Product_Table
WHERE Product_Table.Product_Name = "ABC"
SELECT $Project_ID = Project_ID
FROM Project_Table
WHERE Project_Name = "Project1"
Please use AND instead of OR.
INSERT INTO ATT_TABLE(Assigned_To_ID,Assigned_By_ID,Env_ID,Product_ID,Project_ID)
SELECT A.Emp_ID, B.Emp_ID, Env_Table.Env_ID, Project_Table.Project_ID, Product_Table.Product_ID
FROM Employee_Table A, Employee_Table B, Env_Table, Product_Table, Project_Table
WHERE A.F_Name= "Shantanu"
AND B.F_Name= "Kapil"
AND Env_Table.Env_Name= "SAT11A"
AND Product_Table.Product_Name = "ABC"
AND Project_Table.Project_Name = "Project1";
But it is best practice to use drop down list in your scenario, i guess.
I know I am sounding dumb but I really need help on this.
I have a Table (let's say Meeting) which Contains a column Participants.
The Participants dataType is varchar(Max) and it stores Participant's Ids in comma separated form like 1,2.
Now my problem is I am passing a parameter called #ParticipantsID in my Stored Procedure and want to do something like this:
Select Participants from Meeting where Participants in (#ParticipantsID)
Unfortunately I am missing something crucial here.
Can some one point that out?
I've been there before... I changed the DB design to have one record contain a single reference to the other table. If you can't change your DB structures and you have to live with this, I found this solution on CodeProject.
New Function
IF EXISTS(SELECT * FROM sysobjects WHERE ID = OBJECT_ID(’UF_CSVToTable’))
DROP FUNCTION UF_CSVToTable
GO
CREATE FUNCTION UF_CSVToTable
(
#psCSString VARCHAR(8000)
)
RETURNS #otTemp TABLE(sID VARCHAR(20))
AS
BEGIN
DECLARE #sTemp VARCHAR(10)
WHILE LEN(#psCSString) > 0
BEGIN
SET #sTemp = LEFT(#psCSString, ISNULL(NULLIF(CHARINDEX(',', #psCSString) - 1, -1),
LEN(#psCSString)))
SET #psCSString = SUBSTRING(#psCSString,ISNULL(NULLIF(CHARINDEX(',', #psCSString), 0),
LEN(#psCSString)) + 1, LEN(#psCSString))
INSERT INTO #otTemp VALUES (#sTemp)
END
RETURN
END
Go
New Sproc
SELECT *
FROM
TblJobs
WHERE
iCategoryID IN (SELECT * FROM UF_CSVToTable(#sCategoryID))
You would not typically organise your SQL database in quite this way. What you are describing are two entities (Meeting & Participant) that have a one-to-many relationship. i.e. a meeting can have zero or more participants. To model this in SQL you would use three tables: a meeting table, a participant table and a MeetingParticipant table. The MeetingParticipant table holds the links between meetings & participants. So, you might have something like this (excuse any sql syntax errors)
create table Meeting
(
MeetingID int,
Name varchar(50),
Location varchar(100)
)
create table Participant
(
ParticipantID int,
FirstName varchar(50),
LastName varchar(50)
)
create table MeetingParticipant
(
MeetingID int,
ParticipantID int
)
To populate these tables you would first create some Participants:
insert into Participant(ParticipantID, FirstName, LastName) values(1, 'Tom', 'Jones')
insert into Participant(ParticipantID, FirstName, LastName) values(2, 'Dick', 'Smith')
insert into Participant(ParticipantID, FirstName, LastName) values(3, 'Harry', 'Windsor')
and create a Meeting or two
insert into Meeting(MeetingID, Name, Location) values(10, 'SQL Training', 'Room 1')
insert into Meeting(MeetingID, Name, Location) values(11, 'SQL Training', 'Room 2')
and now add some participants to the meetings
insert into MeetingParticipant(MeetingID, ParticipantID) values(10, 1)
insert into MeetingParticipant(MeetingID, ParticipantID) values(10, 2)
insert into MeetingParticipant(MeetingID, ParticipantID) values(11, 2)
insert into MeetingParticipant(MeetingID, ParticipantID) values(11, 3)
Now you can select all the meetings and the participants for each meeting with
select m.MeetingID, p.ParticipantID, m.Location, p.FirstName, p.LastName
from Meeting m
join MeetingParticipant mp on m.MeetingID=mp.MeetingID
join Participant p on mp.ParticipantID=p.ParticipantID
the above should produce
MeetingID ParticipantID Location FirstName LastName
10 1 Room 1 Tom Jones
10 2 Room 1 Dick Smith
11 2 Room 2 Dick Smith
11 3 Room 2 Harry Windsor
If you want to find out all the meetings that "Dick Smith" is in you would write something like this
select m.MeetingID, m.Location
from Meeting m join MeetingParticipant mp on m.MeetingID=mp.ParticipantID
where
mp.ParticipantID=2
and get
MeetingID Location
10 Room 1
11 Room 2
I have omitted important things like indexes, primary keys and missing attributes such as meeting dates, but it is clearer without all the goo.
Your table is not normalized. If you want to query for individual participants, they should be split into their own table, along the lines of:
Meeting
MeetingId primary key
Other stuff
Persons
PersonId primary key
Other stuff
Participants
MeetingId foreign key Meeting(MeetingId)
PersonId foreign key Persons(PersonId)
primary key MeetingId,PersonId
Otherwise, you have to resort to all sorts of trickery (what I call SQL gymnastics) to find out what you want. That trickery never scales well - your queries become slow very quickly as the table grows.
With a properly normalized database, the queries can remain fast well into the multi-millions of records (I work with DB2/z where we are used to truly huge tables).
There are valid reasons for sometimes reverting to second normal form (or even first) for performance but that should be a very hard thought out decision (and based on actual performance data). All databases should initially start of in 3NF.
SELECT * FROM Meeting WHERE Participants LIKE '%,12,%' OR Participants LIKE '12,%' OR Participants LIKE '%,12'
where 12 is the ID you are looking for....
Ugly, what a nasty model.
If I understand your question correctly, you are trying to pass in a comma separated list of participant ids and see if it is in your list. This link lists several ways to do such a thing"
[http://vyaskn.tripod.com/passing_arrays_to_stored_procedures.htm][1]
codezy.blogspot.com
If you store the participant ids in a comma-separated list (as text) in the database, you cannot easily query it (as a list) using SQL. You would have to resort to string-operations.
You should consider changing your schema to use another table to map meetings to participants:
create table meeting_participants (
meeting_id integer not null , -- foreign key
participant_id integer not null
);
That table would have multiple rows per meeting (one for each participant).
You can then query that table for individual participants, or number of participants, and such.
If participants is a separate data type you should be storing it as a child table of your meeting table. e.g.
MEETING
PARTICIPANT 1
PARTICIPANT 2
PARTICIPANT 3
Each participant would hold the meeting ID so you can do a query
SELECT * FROM participants WHERE meeting_id = 1
However, if you must store a comma separated list (for some external reason) then you can do a string search to find the appropriate record. This would be a very inefficient way to do a query though.
That is not the best way to store the information you have.
If it is all you have got then you need to be doing a contains (not an IN). The best answer is to have another table that links Participants to Meetings.
Try SELECT Meeting, Participants FROM Meeting CONTAINS(Participants, #ParticipantId)