I am wondering how to partition a table like,
from 0 to 100
from 100 to 200
200 and above
CREATE TABLE grade_main
(
id serial not null,
g int not null
) partition by range (g);
CREATE TABLE grade_00_100 PARTITION OF grade_main FOR VALUES FROM (0) TO (100);
CREATE TABLE grade_100_200 PARTITION OF grade_main FOR VALUES FROM (100) TO (200);
-- The following returns syntax error
CREATE TABLE grade_150_all PARTITION OF grade_main FOR VALUES FROM (150);
To soecify a range that has no upper limit, use
FOR VALUES FROM (150) TO (MAXVALUE)
Related
I have this row in the database table:
ID requiredQty
1088 30
And another table:
ID orderLineID bookedInQty
3000 1088 10
3001 1088 10
dbfiddle: https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=9ecd8c83fcda08453481ec6d0ce45947
Summary
Total booked in quantity is total of 20 and 10 remaining for that particular order-line.
Question
How can I create an if statement to insert a record into the 2nd table, not to exceed table 1 requiredQty: 30?
Example
If insert bookedInQty: 11 this means it exceeds 30 because there is an extra 1. If it exceeds, simply do nothing.
If to insert bookedInQty: 9 this does not exceeds 30 because the total now equals to 29. Then insert this record.
Note
Without creating any extra tables, I am trying to do it using an if statement.
This uses if to check if the sum of the bookedQty and the new value are lower then the required quantity. You can put the code in a stored procedure.
create table table1(
id int NOT NULL,
requiredQty int
);
create table table2(
id int NOT NULL,
orderLineId int,
bookedInQty int
);
insert into table1(id, requiredQty) VALUES (1088, 30);
insert into table2(id, orderLineId, bookedInQty)
VALUES
(3000, 1088, 10),
(3001, 1088, 10);
declare #sumQty int, #newQty int, #newOrderLineId int;
select #newOrderLineId = 1088, #newQty = 11; -- change #newQty to 10 or lower
select #sumQty = sum(bookedInQty) from table2 where orderLineId = #newOrderLineId
group by orderLineId;
-- I hardcoded the value of id, it should add 1 to the maximum value or use an identity column
if exists(select * from table1 where id = #newOrderLineId and requiredQty >= #sumQty + #newQty)
insert table2 (id, orderLineId, bookedInQty) values (3002, #newOrderLineId, #newQty);
select * from table1;
select * from table2;
Dbfiddle demo:
https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=d800624279381f9bbd71cf51bbc5351a
a table in my MSSQL db is getting over 500MB. I would like to delete the x last entries so the table size is only 100MB. This should be a task which runs once a week. How could I do this?
Example:
Table before deleting the old entries:
Table after deleting the old entries:
You can use DATALENGTH to get the size of the data in a particular column. With a window function, you can sum up a running total of DATALENGTH values. Then you can delete all records in a table that push you past a desired max table size. Here's an example:
-- Sample table with a VARBINARY(MAX) column
CREATE TABLE tmp (id INT IDENTITY(1,1) PRIMARY KEY, col VARBINARY(MAX))
-- Insert sample data - 20 bytes per row.
;WITH cte AS
(
SELECT 1 AS rn, HASHBYTES('sha1', 'somerandomtext') t
UNION all
SELECT rn + 1, HASHBYTES('sha1', 'somerandomtext')
FROM cte
WHERE rn< 5000
)
INSERT INTO tmp (col)
SELECT t FROM cte
OPTION (maxrecursion 0)
-- #total_bytes is the desired size of the table after the delete statement
DECLARE #total_bytes int = 200
-- Use the SUM window function to get a running total of the DATALENGTH
-- of the VARBINARY field, and delete when the running total exceeds
-- the desired table size.
-- You can order the window function however you want to delete rows
-- in the correct sequence.
DELETE t
FROM tmp t
INNER JOIN
(
SELECT id, SUM(DATALENGTH(col)) OVER (ORDER BY id) total_size
FROM tmp
)sq ON t.id = sq.id AND sq.total_size > #total_bytes
Now check what's left in tmp: 10 rows, and the total size of the "col" column matches the 200 byte size specified in the #total_bytes variable.
UPDATE: Here's an example using your sample data:
CREATE TABLE tmp (id INT PRIMARY KEY, contact VARCHAR(100), country VARCHAR(25))
GO
INSERT INTO tmp VALUES
(1, 'Maria Anders', 'Germany'),
(2, 'Francisco Chang', 'Mexico'),
(3, 'Roland Mendel', 'Austria'),
(4, 'Helen Bennett', 'UK'),
(5, 'Yoshi Tannamuri', 'Canada'),
(6, 'Giovanni Rovelli', 'Italy')
GO
-- #total_bytes is the desired size of the table after the delete statement
DECLARE #total_bytes INT = 40
-- Use the SUM window function to get a running total of the DATALENGTH
-- of the VARBINARY field, and delete when the running total exceeds
-- the desired table size.
-- You can order the window function however you want to delete rows
-- in the correct sequence.
DELETE t
FROM tmp t
INNER JOIN
(
SELECT id, SUM(DATALENGTH(contact)) OVER (ORDER BY id)
+ SUM(DATALENGTH(country)) OVER (ORDER BY id) total_size
FROM tmp
)sq ON t.id = sq.id AND sq.total_size > #total_bytes
SELECT * FROM tmp -- 2 rows left!
DELETE FROM TABLE_NAME WHERE date_column < '2018-01-01';
This will delete all data that entered before January 2018
if you want to delete last 7days data
delete from table_name WHERE date_column >= DATEADD(day,-7, GETDATE())
I have a table containing an identity column as well as a column representing the creation date:
CREATE TABLE dbo.OrderStatus
(
OrderStatusId int IDENTITY(1, 1) NOT NULL,
CreationDate datetime NOT NULL default GETDATE(),
CONSTRAINT PK_OrderStatus PRIMARY KEY(OrderStatusId)
)
Since the identity column generates a value by itself and the CreationDate is always going to be the current date (GETDATE()), I can add a row thanks to DEFAULT VALUES:
INSERT INTO dbo.OrderStatus DEFAULT VALUES;
But what can I do if I want to add, let's say, three records?
Current solution (edited some input since it didn't make any sense)
For now, in order to do what I want, I add several rows with VALUES:
INSERT INTO dbo.OrderStatus (CreationDate)
VALUES (GETDATE()),
(GETDATE()),
(GETDATE())
Although, I'd prefer to know the equivalent of INSERT INTO .. DEFAULT VALUES for multiple rows, in case that I add another column with a default value later on.
Is there a way to insert N rows into a table with DEFAULT VALUES or in a similar way?
An easier way is:
insert dbo.OrderStatus default values
go 500
this will insert 500 rows of default values.
You can use your original definition and just use a while loop, for example
DECLARE #OrderStatus TABLE
(
OrderStatusId int IDENTITY(1, 1) NOT NULL,
CreationDate datetime NOT NULL DEFAULT GETDATE()
--CONSTRAINT PK_OrderStatus PRIMARY KEY(OrderStatusId) -- this can be uncommented if creating a real table.
)
DECLARE #i int = 0;
WHILE #i < 100 -- insert 100 rows. change this value to whatever you want.
BEGIN
INSERT #OrderStatus DEFAULT VALUES
SET #i = #i + 1;
END
SELECT * FROM #OrderStatus
Here's how to do it using a recursive CTE:
;with cteNums(n) AS
(
SELECT 1
UNION ALL
SELECT n + 1
FROM cteNums WHERE n < 100 -- how many times to iterate
)
INSERT #OrderStatus
SELECT * FROM cteNums
Just note that for the CTE you'd have to specify OPTION(MAXRECURSION ...) if it's greater than 100. Also note that even though you're selecting a list of numbers from the CTE, they don't actually get inserted into the table.
The Tally Table method can insert large sets of multiple rows, providing the tally table is big enough. This Tally table will handle up to 1000 entries.
WITH Tally (n) AS
(
-- 1000 rows
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL))
FROM (VALUES(0),(0),(0),(0),(0),(0),(0),(0),(0),(0)) a(n)
CROSS JOIN (VALUES(0),(0),(0),(0),(0),(0),(0),(0),(0),(0)) b(n)
CROSS JOIN (VALUES(0),(0),(0),(0),(0),(0),(0),(0),(0),(0)) c(n)
)
--SELECT * FROM Tally;
Create Table #temp (id int, d datetime, GUID uniqueidentifier, str1 nvarchar(1), number int)
insert into #temp
select n, getdate(), newid(), 'a', 101 from tally
where N<=100 -- THIS IS WHERE YOU INDICATE HOW MANY ROWS
select * from #temp
Set up a trigger when a new row is CREATEd:
https://msdn.microsoft.com/en-us/library/ms189799.aspx
I have a Three columns in the SQL table,
I want to show the sum of the total of two columns in the third column. How can I show that using SQL query.
This is my table structure
Id int Unchecked
Col_A int Unchecked
Col_B int Unchecked
Total int Checked
There is no need to store the total in the table, you can simply calculate it as part of your SQL query as follows:
SELECT
Id,
Col_A,
Col_B,
Col_A + Col_B AS Total
FROM tablename
You can use comuted column for this:
CREATE TABLE [dbo].[Test](
[a] [INT] NULL,
[b] [INT] NULL,
[c] AS ([a]+[b])
) ON [PRIMARY]
GO
INSERT INTO dbo.Test
( a, b )
VALUES ( 1, -- a - int
2 -- b - int
)
SELECT * FROM dbo.Test
Results:
a b c
1 2 3
Here is my table where the colums are salary and variable.
Now i need the sum of basic and variable as total.
Here is the query for that-
select basic,variable,(basic+variable) as total from salary
or if you just want to display total:
Try the following -
ALTER TABLE TABLENAME ADD colC AS ColA * ColB
I have got an over 500 rows table with a column called ID which is of datetype INT. Currently the values are all NULL.
What I want to achieve is to populate the ID column with an incremental number for each row, say 1, 2, 3, 4, ..., 500 etc.
Please give me a help with any idea how to achieve this by SQL script.
using ROW_NUMBER in a CTE is one way, but here's an alternative; Create a new id1 column as int identity(1,1), then copy over to id, then drop id1:
-- sample table
create table myTable(id int, value varchar(100));
-- populate 10 rows with just the value column
insert into myTable(value)
select top 10 'some data'
from sys.messages;
go
-- now populate id with sequential integers
alter table myTable add id1 int identity(1,1)
go
update myTable set id=id1;
go
alter table myTable drop column id1;
go
select * from myTable
Result:
id value
----------- -------------
1 some data
2 some data
3 some data
4 some data
5 some data
6 some data
7 some data
8 some data
9 some data
10 some data
While you could also drop and recreate ID as an identity, it would lose its ordinal position, hence the temporary id1 column.
#create one temporary table
CREATE TABLE Tmp
(
ID int NOT NULL
IDENTITY(1, 1),
field(s) datatype NULL
)
#suppose your old table name is tbl,now pull
#Id will be auto-increment here
#dont select Id here as it is Null
INSERT INTO Tmp (field(s) )
SELECT
field(s)
FROM tbl
#drop current table
DROP TABLE tbl
#rename temp table to current one
Exec sp_rename 'Tmp', 'tbl'
#drop your temp table
#write alter command to set identitry to Id of current table
good luck