I have 2 tables. What is important is the PlayerId and the Username.
CREATE TABLE [dbo].[Run]
(
[RunId] INT NOT NULL,
[PlayerId] INT NOT NULL,
[Duration] TIME(7) NOT NULL,
[DateUploaded] NCHAR(10) NOT NULL,
[VersionId] INT NOT NULL,
PRIMARY KEY CLUSTERED ([RunId] ASC),
CONSTRAINT [FK_Run_Player]
FOREIGN KEY ([PlayerId]) REFERENCES [dbo].[Player] ([PlayerId]),
CONSTRAINT [FK_Run_Version]
FOREIGN KEY ([VersionId]) REFERENCES [dbo].[Version] ([VersionId])
);
CREATE TABLE [dbo].[Player]
(
[PlayerId] INT NOT NULL,
[Username] NCHAR(20) NOT NULL,
[ProfilePicture] IMAGE NULL,
[Country] NCHAR(20) NOT NULL,
[LeagueId] INT NULL,
[DateJoined] DATE NULL,
PRIMARY KEY CLUSTERED ([PlayerId] ASC),
CONSTRAINT [FK_Player_League]
FOREIGN KEY ([LeagueId]) REFERENCES [dbo].[League] ([LeagueId])
);
I have a select command:
SELECT
PlayerId, Duration, VersionId, DateUploaded
FROM
[Run]
(with apologies in advance for my messy made up pseudocode), what I need it to do is:
SELECT (Player.PlayerId.Username)
What I basically need it to do, is instead of giving me just PlayerId, I need it to get the corresponding Username (from the other table) that matches each PlayerId (PlayerId is a foreign key)
So say for example instead of returning
1, 2, 3, 4, 5
it should return
John12, Abby2003, amy_932, asha7494, luke_ww
assuming, for example, Abby2003's PlayerId was 2.
I've done trial and error and either nobody's tried this before or I'm searching the wrong keywords. This is using VS 2022, ASP.NET Web Forms, and Visual Basic, but that shouldn't affect anything I don't think. Any syntax ideas or help would be greatly appreciated.
try this for join the 2 Table togother
SELECT R.RunId
,R.PlayerId
,R.Duration
,R.DateUploaded
,R.VersionId
,P.Username
,P.ProfilePicture
,P.Country
,P.LeagueId
,P.DateJoined
FROM Run R
inner join Player P on R.PlayerId = P.PlayerId
Usually in this case joins are used. You can join the two tables together, give them aliases (or don't, personal preference really), then select what you need. In this case, you would probably want an inner join. Your query would probably look something like this:
SELECT p.Username FROM [Run] r
INNER JOIN [Player] p ON r.PlayerId = p.PlayerId
Then if you need to you can put a WHERE clause after that.
More about joins here
Related
I am attempting to create a recipes database where a user can input ingredients and it will output a list of potential recipes. I have created three tables:
CREATE TABLE [dbo].[Ingredients] (
[Ingredient_ID] INT IDENTITY (1, 1) NOT NULL,
[Name] VARCHAR (50) NOT NULL,
PRIMARY KEY CLUSTERED ([Ingredient_ID] ASC)
);
CREATE TABLE [dbo].[recipes] (
[Recipe_ID] INT IDENTITY (1, 1) NOT NULL,
[Name] VARCHAR (50) NOT NULL,
[Instructions] TEXT NULL,
[Preperation_Time] FLOAT (53) NULL,
[Author] VARCHAR (50) NULL,
CONSTRAINT [PK.recipes] PRIMARY KEY CLUSTERED ([Recipe_ID] ASC)
);
CREATE TABLE [dbo].[RecipeIngredients] (
[Recipe_ID] INT NOT NULL,
[Ingredient_ID] INT NOT NULL,
PRIMARY KEY CLUSTERED ([Recipe_ID] ASC, [Ingredient_ID] ASC),
CONSTRAINT [FK_RecipeIngredients_To_Ingredients] FOREIGN KEY ([Ingredient_ID]) REFERENCES [dbo].[Ingredients] ([Ingredient_ID]),
CONSTRAINT [FK_RecipeIngredients_To_Recipes] FOREIGN KEY ([Recipe_ID]) REFERENCES [dbo].[recipes] ([Recipe_ID])
);
I have populated all tables and I am now attempting to retrieve the recipes based on what the user has entered.
I have a created a test SQL statement to retrieve all recipes that contain 'Eggs' using:
string sqlString = "SELECT recipes.Name, Instructions, recipes.Preperation_Time, Author FROM RecipeIngredients" +
" INNER JOIN recipes ON recipes.Recipe_ID = RecipeIngredients.Recipe_ID" +
" INNER JOIN Ingredients ON Ingredients.Ingredient_ID = RecipeIngredients.Ingredient_ID" +
" WHERE ingredients.Name = 'Eggs'";
The data does not show up in my dataGridView, but I am unsure if it is because the statement is wrong or other factors.
Is the statement correct? I am unfamiliar with the INNER JOIN command.
I am also unsure how to design an Sql statement that can take a varying amount of ingredient names without creating an Sql statement for every possibility.
Thanks in advance, if you need me to expand on anything I have asked please ask.
Here is the query that should work. Use of aliases is recommended
SELECT r.Name, r.Instructions, r.Preperation_Time, r.Author
FROM Ingredients i
join RecipeIngredients ri on i.Ingredient_ID = ri.Ingredient_ID
join recipes r on ri.Recipe_ID = r.Recipe_ID
where i.Name = 'Eggs'
You may want to run it through SQL Server Management Studio to ascertain return of result before coding it in C# solution.
I am not the best SQL programmer so I am basically asking someone for help writing a query that will get my desired result. Here is the table structure for the scope of the query.
CREATE TABLE [dbo].[tblOverNightPermissions] (
[DateAndTime] DATETIME NULL,
[Address] NVARCHAR (200) NULL,
[Direction] NVARCHAR (102) NULL,
[NoOfDays] INT NULL,
[UserID] INT NOT NULL,
[OverNightID] INT IDENTITY (1, 1) NOT NULL,
[Exempt] INT NULL,
[Beat] INT NULL,
CONSTRAINT [PrimaryKey_1fd244dd-bfd8-4998-8439-4d7d7893d387] PRIMARY KEY CLUSTERED ([OverNightID] ASC),
CONSTRAINT [FK_tblOverNightPermissions_0] FOREIGN KEY ([UserID]) REFERENCES [dbo].[tblUsers] ([UserID])
);
CREATE TABLE [dbo].[tblOverNightToVehicles] (
[OverNightID] INT NOT NULL,
[VehicleID] INT NOT NULL,
[ID] INT IDENTITY (1, 1) NOT NULL,
CONSTRAINT [PrimaryKey_b433eaad-fb12-493c-9302-3f3bd9bd74e3] PRIMARY KEY CLUSTERED ([ID] ASC),
CONSTRAINT [FK_tblOverNightToVehicles_0] FOREIGN KEY ([OverNightID]) REFERENCES [dbo].[tblOverNightPermissions] ([OverNightID]) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT [FK_tblOverNightToVehicles_1] FOREIGN KEY ([VehicleID]) REFERENCES [dbo].[tblVehicles] ([VehicleID]) ON DELETE CASCADE ON UPDATE CASCADE
);
What I want to do is select record from tblOverNightPermissions and group them by month. I also want to count the number of records for that month and grouped by the vehicle ID which is in tblOverNightToVehicles. The goal is to run a check to make sure there have not been more than 5 overnightpermissions per vehicle id per month. It gets kind of tricky because the database design is not sound. As you can see, the NoOfDays field in the tblOvernightPermissions makes things complicated. Instead of there always being a set number of records per month, users have the ability to select up to 5 consecutive days of parking. So if I park today and select 5 days my record entry will look like this
DateAndTime = 5/8/2014
Address = x
Direction = S
NoOfDays = 5
UserId = 1
OvernightId = 1
Exempt = 0
Beat = 2
That means, for the month I will only have one physical record in tblOverNightPermissions that represents 5 days of parking. I could just as easily create 5 records in the table to signify 5 days of parking and thats where the issue comes in. Writing conditionals in TSQL to take into account if a record has NoOfDays > 1 add that to the count of the physical records for the month.
Here are the scripts to populate your databases
Script to populate tblOvernightPermissions https://dl.dropboxusercontent.com/u/62170850/tblOvernightPermissions.txt
Script to populate tblOvernightToVehicles
https://dl.dropboxusercontent.com/u/62170850/tblOverNightToVehicles.txt
SELECT DATEADD(month, DATEDIFF(month, 0, p.DateAndTime), 0) AS [Month],
SUM(p.NoOfDays) As Days
FROM tblOverNightPermissions p
INNER JOIN tblOverNightToVehicles v ON p.OverNightID = v.OverNightID
GROUP BY DATEADD(month, DATEDIFF(month, 0, p.DateAndTime), 0), v.VehicleID
HAVING SUM(p.NoOfDays) >= 5
I'm not entirely sure if I'm even going about this in the right manner.
MVC+EF site so i could do this in the controller but I would prefer it in the DB if possible.
I have two tables. One contains entries and one contains a list of members. I want the list of members to have a column that contains the count of how many times the member name appears in the list of entries. Can I do this in the definition of the table itself?
I know this query works:
select count(*)
from dbo.Entries
where dbo.Entries.AssignedTo = 'Bob Smith'
But is there any way of doing this? What is the correct syntax?
CREATE TABLE [dbo].[Members] (
[ID] INT IDENTITY (1, 1) NOT NULL,
[Name] NVARCHAR (100) NOT NULL,
[Email] NVARCHAR (500) NOT NULL,
[Count] INT = select count(*) from dbo.Entries where dbo.Entries.AssignedTo = [Name]
PRIMARY KEY CLUSTERED ([ID] ASC)
I've done some searching and have tried a few different syntax's but I'm completely lost at this point so if anyone can get me headed in the correct direction I would really appreciate it.
Thanks in advance.
You could create Members as a view combining both the Entries data and another table. (Warning: Syntax not tested)
CREATE TABLE [_member_data] (
[ID] INT IDENTITY(1, 1) NOT NULL,
[Name] NVARCHAR (100) NOT NULL,
[Email] NVARCHAR (500) NOT NULL,
PRIMARY KEY CLUSTERED ([ID] ASC)
);
CREATE VIEW [dbo].[Members] AS
SELECT ID, Name, Email, COUNT(*)
FROM _member_data JOIN dbo.Entries ON [Name] = [AssignedTo]
GROUP BY 1, 2, 3;
It is possible to take this even further with triggers/rules that rewrite attempted inserts into Members as inserts to the appropriate backing table. But to get the kind of expressive information that you are looking for, you really want to explore using a view.
I have to create a table in sql where one of the columns stores awards for a movie. The schema says it should store something like Oscar, screenplay. Is it possible to store two values in the same field in SQL. If so what datatype would that be and how would you query the table for it?
It's a horrible design pattern to store more than one piece of data in a single column in a relational database. The exact design of your system depends on several things, but here is one possible way to model it:
CREATE TABLE Movie_Awards (
movie_id INT NOT NULL,
award_id INT NOT NULL,
CONSTRAINT PK_Movie_Awards PRIMARY KEY CLUSTERED (movie_id, award_id)
)
CREATE TABLE Movies (
movie_id INT NOT NULL,
title VARCHAR(50) NOT NULL,
year_released SMALLINT NULL,
...
CONSTRAINT PK_Movies PRIMARY KEY CLUSTERED (movie_id)
)
CREATE TABLE Awards (
award_id INT NOT NULL,
ceremony_id INT NOT NULL,
name VARCHAR(50) NOT NULL, -- Ex: Best Picture
CONSTRAINT PK_Awards PRIMARY KEY CLUSTERED (award_id)
)
CREATE TABLE Ceremonies (
ceremony_id INT NOT NULL,
name VARCHAR(50) NOT NULL, -- Ex: "Academy Awards"
nickname VARCHAR(50) NULL, -- Ex: "Oscars"
CONSTRAINT PK_Ceremonies PRIMARY KEY CLUSTERED (ceremony_id)
)
I didn't include Foreign Key constraints here, but hopefully they should be pretty obvious.
Anything's possible; that doesn't mean it's a good idea :)
Far better to normalize your structure and store types like so:
AwardTypes:
AwardTypeID
AwardTypeName
Movies:
MovieID
MovieName
MovieAwardType:
MovieID
AwardTypeID
You can serialize your data in Json format,store Json string, and deselialize on read. More sefer than using your own format
Data presentation does't have to be so close tied with phisical data organisation. Wouldn't it be bether to store these two data in two separate columns and then just do some kind of concatenation at the display time?
It is much less painfull to join data than to split it, if you happen to need just a screenplay, one day...
So I've been doing this all night - can't quite understand my homework, and sadly my professor is unavailable on the weekend. I've posted a few of these questions, this being the last one. I've got something to go on, but it needs working (and coming out of this I'd love to fully understand the answer so I don't need help on something similar again). Here it goes: Find the name and the phone number of the theaters that show the maximum number of movies. Make sure your query works when there is a tie between several theatres.
Here are my table declares (and thank you to EVERYONE helping me out tonight, I owe you big time).
CREATE TABLE Theatres (
Name varchar2(50) not null,
City varchar2(50) not null,
State varchar2(50) not null,
Zip number not null,
Phone varchar2(50) not null,
PRIMARY KEY (Name)
);
CREATE TABLE Movies (
Title varchar2(100) not null,
Rating NUMBER not null,
Length NUMBER not null,
ReleaseDate date not null,
PRIMARY KEY (Title),
CHECK (Rating BETWEEN 0 AND 10),
CHECK (Length > 0),
CHECK (ReleaseDate > to_date('1/January/1900', 'DD/MONTH/YYYY'))
);
CREATE TABLE ShownAt (
TheatreName varchar2(50) not null,
MovieTitle varchar2(100) not null,
PRIMARY KEY (TheatreName, MovieTitle),
FOREIGN KEY (TheatreName) REFERENCES Theatres(Name),
FOREIGN KEY (MovieTitle) REFERENCES Movies(Title)
);
I'm trying to apply some of the things I've learned from StackOverflow members help in other questions, but I'm not sure how to return something based on the max results of a column. Any help would be greatly appreciated.
Here's one way.
With T As
(
SELECT T.Name, T.Phone,
RANK() OVER (ORDER BY COUNT(S.MovieTitle ) DESC) AS Rnk
FROM Theatres T
JOIN ShownAt S ON S.TheatreName= T.Name
GROUP BY T.Name, T.Phone
)
SELECT Name, Phone
FROM T
WHERE Rnk=1;