I have 2 tables
CREATE TABLE [dbo].[Owners]
(
[OwnerId] [int] NOT NULL,
[AccessToken] [nvarchar](50) NULL,
[TokenSecret] [nvarchar](50) NULL
)
CREATE TABLE [dbo].[Tweets]
(
[TweetId] [int] IDENTITY(1,1) NOT NULL,
[ReferenceId] [int] NULL,
[TweetContent] [nvarchar](max) NULL,
[ReferenceType] [int] NOT NULL,
[AccessToken] [nvarchar](50) NULL,
[TokenSecret] [nvarchar](50) NULL,
)
I would like to return all fields of tweets, and based on if there is an owners for the tweet, the AccessToken/TokenSecret will come from the owner table, if not then it will come from the tweets table.
I am having a hard time figuring out the best/efficient way to write this query.
This is what I have so far (only returns from main table, not owner if there is one)
SELECT *
FROM Tweets t
LEFT JOIN Owners o ON t.ReferenceId = o.OwnerId
WHERE t.ReferenceType = 1
I am using SQL Server 2017, in the tweet table, ReferenceId is the ownerid correspondence to he tweets table
Perhaps coalesce would be helpful to select the first non-null value:
select coalesce(o.AccessToken, t.AccessToken) as actualAccessToken [...]
Related
I need to order my query in a different way i need to group my tables. I need to count how many men are in every department, but organize the query by quantity of people (Not only men, but also women) in every department, in descending way.
This is the diagram and the code of the tables:
Relational model of the tables
CREATE SCHEMA Academico;
CREATE TABLE Academico.PAIS(
ID int NOT NULL,
NOMBRE varchar(30) NOT NULL,
DESCRIPCION varchar(120) NULL,
CONSTRAINT PK_PAIS PRIMARY KEY (ID));
CREATE TABLE Academico.DEPARTAMENTO(
ID int NOT NULL,
NOMBRE varchar(30) NOT NULL,
CODIGO int NOT NULL,
DESCRIPCION varchar(120) NULL,
IDPAIS int NOT NULL,
CONSTRAINT PK_DEPARTAMENTO PRIMARY KEY (ID));
CREATE TABLE Academico.CIUDAD(
ID int NOT NULL,
NOMBRE varchar(255) NOT NULL,
CODIGO int NOT NULL,
DESCRIPCION varchar(120) NULL,
IDDEPARTAMENTO int NOT NULL,
CONSTRAINT PK_CIUDAD PRIMARY KEY (ID));
ALTER TABLE Academico.DEPARTAMENTO
ADD CONSTRAINT FK_DEPARTAMENTO_PAIS FOREIGN KEY(IDPAIS)
REFERENCES Academico.PAIS (ID)
on delete restrict on update restrict;
ALTER TABLE Academico.CIUDAD
ADD CONSTRAINT FK_CIUDAD_DEPARTAMENTO FOREIGN KEY(IDDEPARTAMENTO)
REFERENCES Academico.DEPARTAMENTO (ID)
on delete restrict on update restrict;
CREATE TABLE Academico.SEXO(
ID int NOT NULL,
NOMBRE varchar(30) NOT NULL,
DESCRIPCION varchar(120) NULL,
CONSTRAINT PK_SEXO PRIMARY KEY (ID));
CREATE TABLE Academico.TIPODOCUMENTO(
ID int NOT NULL,
NOMBRE varchar(30) NOT NULL,
DESCRIPCION varchar(120) NULL,
CONSTRAINT PK_TIPODOCUMENTO PRIMARY KEY (ID));
CREATE TABLE Academico.PERSONA(
ID int NOT NULL,
NOMBRE varchar(10) NOT NULL,
APELLIDO varchar(30) NOT NULL,
IDSEXO int NOT NULL REFERENCES Academico.SEXO(id),
IDCIUDAD int NOT NULL REFERENCES Academico.CIUDAD(id),
DOCUMENTO varchar(50) NOT NULL,
IDTIPODOCUMENTO int NOT NULL REFERENCES Academico.TIPODOCUMENTO(id),
FECHANACIMIENTO date NULL CHECK (FECHANACIMIENTO > '1900-01-01'),
FEvarcharEGISTRO date NOT NULL DEFAULT Now() ,
email varchar (355) UNIQUE NOT NULL,
PROFESION varchar(12) NULL,
PERFIL varchar(120) NULL,
CONSTRAINT PK_PERSONA PRIMARY KEY
(ID) );
I tried this two querys that give me the expected results but in a separated way:
select
d.nombre as _departamento, s.nombre as sex, count(1) as total_sexo
from
academico.persona p, academico.sexo s,
academico.ciudad c, academico.departamento d
where
p.idsexo = s.id
and p.idciudad = c.id
and c.iddepartamento = d.id
and upper( s.nombre ) = 'MASCULINO'
group by
d.id,
s.id
order by
d.nombre
-- =======================================================
-- I don't know how to "merge" these two into one query
-- =======================================================
select
d.nombre as _departamento, count(1) as total_gente
from
academico.persona p, academico.ciudad c,
academico.departamento d, academico.sexo s
where
p.idciudad = c.id
and c.iddepartamento = d.id
and p.idsexo = s.id
group by
d.id
order by
total_gente desc
;
I need to get those results with only one query
This is the perfect use for the FILTER (WHERE...) construct.
...
count(1) as total_gente,
count(1) filter (where upper( s.nombre ) = 'MASCULINO') as total_masculino
...
And then take the upper( s.nombre ) = 'MASCULINO' out of the main where clause.
I have two table: User and Team.
They are in a many-to-many relation.
I would like to get all teams of a specific user.
Seams really simple but I can't find the answer anywhere..
Do you know how can I do ?
On the many-to-many relation must be 3rd table. This table contained user_id and team_id connections.
For example:
CREATE TABLE user (
id serial4 NOT NULL,
first_name varchar(200) NOT NULL,
last_name varchar(200) NULL,
CONSTRAINT user_pk PRIMARY KEY (id)
);
CREATE TABLE team (
id serial4 NOT NULL,
team_name varchar NOT NULL,
team_about text NULL,
CONSTRAINT team_pk PRIMARY KEY (id)
);
CREATE TABLE user_team (
id serial4 NOT NULL,
user_id int4 NOT NULL,
team_id int4 NOT NULL,
CONSTRAINT user_team_pk PRIMARY KEY (id)
);
-- filter and select team by user_id
select t.* from examples.team t
inner join examples.user_team usrt on usrt.team_id = t.id
where usrt.user_id = 2;
My source table, which is located in an Azure SQL Server Data Warehouse, has a column named Upline with the data type varbinary(1000). In the destination table, located in the same Azure SQL Server Data Warehouse, the data type and column name are the same. My issue is in the Azure Data Flow that is populating the destination table.
Instead of inserting the data into the sink table in the data flow, it is creating a new table in my data warehouse. Here is the create statement for the table that is being created with
CREATE TABLE [Common].[T_7be15bb497654f0c8eeb82459912f178]
(
[EmployeeSK] [int] NULL,
[EmployeeLastName] [nvarchar](max) NULL,
[EmployeeFirstName] [nvarchar](max) NULL,
[EmploymentStatus] [nvarchar](max) NULL,
[HireDate] [date] NULL,
[OriginalHireDate] [date] NULL,
[TerminationDate] [date] NULL,
[CurrentPosition] [nvarchar](max) NULL,
[PreviousPosition] [nvarchar](max) NULL,
[WorkAssignmentEffectiveStart] [date] NULL,
[Region] [nvarchar](max) NULL,
[District] [nvarchar](max) NULL,
[Site] [nvarchar](max) NULL,
[OnSiteDepartment] [nvarchar](max) NULL,
[DepartmentName] [nvarchar](max) NULL,
[ManagerDayForceEmployeeNumber] [nvarchar](max) NULL,
[Upline] [varbinary](max) NULL,
[Lvl] [int] NULL,
[dimStartDate] [date] NULL,
[dimEndDate] [date] NULL,
[dimIsCurrent] [int] NULL,
[dimHash] [nvarchar](max) NULL,
[r7ace46966877481a90d6f8039c6524b5] [int] NULL
)
As you can see from the picture (if you can see the picture), the table is giving the column Upline a varbinary(max) data type. Why is this happening? How can I stop it from happening? When I take this column out of the source and destination tables it works successfully. However, I need the column. The data flow has these activities: source, select, derived column, surrogate key, and sink. It is doing very simple stuff and the Upline is not being changed in the derived column.
Here is the error message from the pipeline that runs the data flow:
"Found an implicit conversion from VarBinary(Max) to VarBinary(1000) that requires ANSI truncation warning. This is not supported. Use the CONVERT function explicitly to execute this request." There is no convert function in the derived column activity so I can't do the suggestion it gives.
The max length of the data in the column is 24 (found using Select len(max(Upline))FROM [source table]).
Any help would be appreciated. Thanks.
I found a work around. In the create statement of the destination table I changed varbinary(1000) to be varbinary(max) and, at the end, I replaced this ending:
WITH
(
DISTRIBUTION = ROUND_ROBIN,
CLUSTERED COLUMNSTORE INDEX
)
GO
with this:
WITH
(
DISTRIBUTION = ROUND_ROBIN,
HEAP
)
GO
Now, the whole create statement looks like this:
CREATE TABLE [Common].[dimEmployee_temp]
(
[EmployeeSK] [int] IDENTITY(1,1) NOT NULL,
[DayForceEmployeeNumber] [nvarchar](255) NOT NULL,
[ConaEmployeeNumber] [char](10) NULL,
[EmployeeLastName] [nvarchar](255) NULL,
[EmployeeFirstName] [nvarchar](255) NULL,
[EmploymentStatus] [nvarchar](255) NULL,
[HireDate] [date] NULL,
[OriginalHireDate] [date] NULL,
[TerminationDate] [date] NULL,
[CurrentPosition] [nvarchar](255) NULL,
[PreviousPosition] [nvarchar](255) NULL,
[WorkAssignmentEffectiveStart] [date] NULL,
[Region] [nvarchar](255) NULL,
[District] [nvarchar](255) NULL,
[Site] [nvarchar](255) NULL,
[OnSiteDepartment] [nvarchar](255) NULL,
[DepartmentName] [nvarchar](255) NULL,
[UnionName] [nvarchar](255) NULL,
[ManagerDayForceEmployeeNumber] [nvarchar](255) NULL,
[Upline] [varbinary](max) NULL,
[Lvl] [int] NULL,
[dimStartDate] [date] NOT NULL,
[dimEndDate] [date] NULL,
[dimIsCurrent] [int] NOT NULL,
[dimHash] [nvarchar](256) NULL
)
WITH
(
DISTRIBUTION = ROUND_ROBIN,
HEAP
)
GO
This doesn't help me understand what is going on in the Azure data flow, but it does run successfully and insert into the table.
In postgresql I have a table which I need to add a new column. the original table ddl is belowing:
CREATE TABLE survey.survey_response (
id uuid NOT NULL DEFAULT uuid_generate_v4(),
survey_id uuid NOT NULL,
survey_question_id uuid NULL,
user_id varchar(256) NULL,
device_id varchar(256) NULL,
user_country varchar(100) NULL,
client_type varchar(100) NULL,
product_version varchar(100) NULL,
answer text NULL,
response_date timestamptz NOT NULL DEFAULT now(),
survey_category varchar(100) NULL,
tags varchar(250) NULL,
tracking_id uuid NULL,
CONSTRAINT survey_response_pkey PRIMARY KEY (id)
)
WITH (
OIDS=FALSE
) ;
Then I alter the table to add a new column:
alter table survey.survey_response add column system_tags varchar(30) ;
But after that I found my instert statement cannot make change to this new column, for all the original columns it works fine:
INSERT INTO survey.survey_response
(id, survey_id, user_id, tags, system_tags)
VALUES(uuid_generate_v4(), uuid_generate_v4(),'1123','dsfsd', 'dsfsd');
select * from survey.survey_response where user_id = '1123';
The "tags" columns contains inserted value, however, system_tags keeps null.
I tested the above scenario in my local postgreSQL 9.6, any ideas about this strange behavior? Thanks a lot
-----------------update----------
I found this survey.survey_response table has been partitioning based on month, So my inserted record will also be displayed in survey.survey_response_y2017m12. but the new system_tags column is also NULL
CREATE TABLE survey.survey_response_y2017m12 (
id uuid NOT NULL DEFAULT uuid_generate_v4(),
survey_id uuid NOT NULL,
survey_question_id uuid NULL,
user_id varchar(256) NULL,
device_id varchar(256) NULL,
user_country varchar(100) NULL,
client_type varchar(100) NULL,
product_version varchar(100) NULL,
answer text NULL,
response_date timestamptz NOT NULL DEFAULT now(),
survey_category varchar(100) NULL,
tags varchar(250) NULL,
tracking_id uuid NULL,
system_tags varchar(30) NULL,
CONSTRAINT survey_response_y2017m12_response_date_check CHECK (((response_date >= '2017-12-01'::date) AND (response_date < '2018-01-01'::date)))
)
INHERITS (survey.survey_response)
WITH (
OIDS=FALSE
) ;
If I run the same scenario in a non-partition table then the insert works fine.
So do I need any special settings for alter table for partition table?
Old thread but you need to drop and create again the RULE to fix the issue.
I am trying to create a stored procedure that will drop a table and then create a new table with the same name.
However, when I right clicked on the table and did Script Table as ... DROP and CREATE To ... New Query Editor Window and then copied the script into a blank stored procedure, it wouldn't let me create the procedure because
There is already an object named 'MyTable' in the database
What should I do?
NOTE: the new table will not be the same structure as the old table. I make some transformations using other stored procedures to the table, so at the end, I want to drop it and create from scratch.
Here is the actual script:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[spDropAndCreate]
AS
BEGIN
SET NOCOUNT ON;
IF OBJECT_ID ('dbo.MyTable','U') IS NOT NULL
DROP TABLE [dbo].[MyTable]
CREATE TABLE [dbo].[MyTable]
(
[ID] [int] IDENTITY(1,1) NOT NULL,
[Col1] [nvarchar](50) NULL,
[Col2] [nvarchar](50) NULL,
[Col3] [nvarchar](50) NULL,
[Col4] [nvarchar](50) NULL,
[Col5] [nvarchar](50) NULL,
[Col6] [nvarchar](50) NULL,
[Col7] [nvarchar](50) NULL,
[Col8] [nvarchar](50) NULL,
[Col9] [nvarchar](50) NULL,
[Col10] [nvarchar](50) NULL
)
GO
END
Here is the error message:
Msg 102, Level 15, State 1, Procedure spDropAndCreate, Line 17 [Batch Start Line 9]
Incorrect syntax near 'MyTable'
Msg 2714, Level 16, State 6, Line 35
There is already an object named 'MyTable' in the database
Msg 102, Level 15, State 1, Line 156
Incorrect syntax near 'END'
You need to remove the GO that is within the BEGIN and END block. GO is a batch separator which is like telling the block to execute before it's even ended. Check out this previous post for more info.
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[spDropAndCreate]
AS
BEGIN
SET NOCOUNT ON;
IF OBJECT_ID ('dbo.MyTable','U') IS NOT NULL
DROP TABLE [dbo].[MyTable]
CREATE TABLE [dbo].[MyTable]
(
[ID] [int] IDENTITY(1,1) NOT NULL,
[Col1] [nvarchar](50) NULL,
[Col2] [nvarchar](50) NULL,
[Col3] [nvarchar](50) NULL,
[Col4] [nvarchar](50) NULL,
[Col5] [nvarchar](50) NULL,
[Col6] [nvarchar](50) NULL,
[Col7] [nvarchar](50) NULL,
[Col8] [nvarchar](50) NULL,
[Col9] [nvarchar](50) NULL,
[Col10] [nvarchar](50) NULL
)
END
Add a GO after the DROP TABLE statement to separate the batches.
This won’t work for a procedure though. Instead uses exists when sys objects.
If exists(select 1 from sys.objects where name = 'mytable')
drop mytable