I have a table with existing data. For each unique value in the first column of this table, we have a column that is supposed to be in sequential order, but this table has gotten out of order. I want to run a SQL statement that will put this second column back in order. I was able to see the results I want with this SQL:
select FORMULA_ID, ATTRIB_CODE, ATTRIB_VAL, ATTRIB_ORDER,
rank() over (partition by formula_id order by attrib_code, attrib_val) AS WANT_THIS
from ATTRIB
Which yields:
FORMULA_ID ATTRIB_CODE ATTRIB_VAL ATTRIB_ORDER WANT_THIS
----------- -------------------- ---------------- ------------ ---------
2791 C_BRAND ROMAN HOLIDAY 3 1
2791 C_ENDUSE DINNER 4 2
2791 C_ENDUSE SNACK 6 3
2791 C_ENDUSER 10-17 7 4
2791 C_PRODTYPE SALAD 13 5
2791 C_RELIG ANY 14 6
2821 C_ALLERGEN PEANUT 1 1
2821 C_ALLERGEN SOY 2 2
2821 C_BRAND ROMAN HOLIDAY 1 3
2821 C_ENDUSE DINNER 1 4
As you can see, the WANT_THIS column orders the rows and resets to 1 when it gets to a new FORMULA_ID. But I don't know how to convert this into an UPDATE statement that will actually put the value in WANT_THIS into the column ATTRIB_ORDER. Is there a way to convert the SQL above into an UPDATE statement?
This is one way:
WITH CTE AS
(
SELECT FORMULA_ID,
ATTRIB_CODE,
ATTRIB_VAL,
ATTRIB_ORDER,
RANK() OVER (PARTITION BY formula_id
ORDER BY attrib_code, attrib_val) AS WANT_THIS
FROM ATTRIB
)
UPDATE CTE
SET ATTRIB_ORDER = WANT_THIS;
This should work on MySql server:
UPDATE attrib
LEFT JOIN (
SELECT formula_id, attrib_code, attrib_val,
rank() over (partition by formula_id order by attrib_code, attrib_val)
want_this FROM attrib
) AS new_values
ON
attrib.formula_id = new_values.formula_id AND
attrib.attrib_code = new_values.attrib_code AND
attrib_val = new_values.attrib_val
SET
attrib_order = new_values.want_this
Short description: We are updating the attrib table. First we must calculate new_values using a subquery. Then we connect (LEFT JOIN) the subquery with existing attrib table. After the connection is made, we exactly know to which row want_this should be applied. The ON condition is long here and it would be better to use unique identifier if possible.
Related
Okay, so this table will work as an example of what I am working with. This table consists of the name of someone and the order they are in compared to others:
NAME
ORDER
ZAC
1
JEFF
2
BART
3
KATE
4
My goal is to take the numbers in ORDER and reposition them randomly and update that into the table, keeping the NAME records in the same position that they were in originally.
Example of the desired result:
NAME
ORDER
ZAC
3
JEFF
1
BART
4
KATE
2
Using the table above, I have tried the following solutions:
#1
Update TEST_TABLE
Set ORDER = dbms_random.value(1,4);
This resulted in the random numbers between 1 and 4 inclusive, but the numbers could repeat, so ORDER could have the same number multiple times
Example of the attempted solution:
NAME
ORDER
ZAC
3
JEFF
1
BART
3
KATE
2
#2
Update TEST_TABLE
Set ORDER = (Select dbms_random.value(1,4) From dual);
This resulted in the same random number being copied into each ORDER record, so if the number came out at 3, then it would change them all to 3.
Example of the attempted solution:
NAME
ORDER
ZAC
3
JEFF
3
BART
3
KATE
3
This is my first time posting to StackOverflow, and I am relatively new to Oracle, so hopefully I proposed this question properly.
How about this?
Sample data:
SQL> select * from test order by rowid;
NAME C_ORDER
---- ----------
Zac 1
Jeff 2
Bart 3
Kate 4
Table is updated based on value acquired by the row_number analytic function which sorts data randomly; matches are found by the rowid value:
SQL> merge into test a
2 using (with counter (cnt) as
3 (select count(*) from test)
4 select t.rowid rid,
5 row_number() over(order by dbms_random.value(1, c.cnt)) rn
6 from counter c cross join test t
7 ) b
8 on (a.rowid = b.rid)
9 when matched then update set
10 a.c_order = b.rn;
4 rows merged.
Result:
SQL> select * from test order by rowid;
NAME C_ORDER
---- ----------
Zac 3
Jeff 4
Bart 1
Kate 2
SQL>
How about this?
MERGE INTO test d USING
(SELECT rownum AS new_order,
name
FROM (SELECT *
FROM test
ORDER BY dbms_random.value)) s
ON (d.name = s.name)
WHEN matched THEN
UPDATE
SET d.sort_order = s.new_order;
The new order is build by simply sorting the original data by random values and using rownum to number those random records from 1 to N.
I use NAME to match the records, but you should use the primary key or rowid as in Littlefoot answer.
Or at least an indexed column (for speed, when the table contains a lot of data), which uniquely identifies a row.
The simplest is to sort the data randomly and join on the "name" column:
merge into data dst
using (
select rownum as rn, name from (
select name from data order by dbms_random.value()
)
) src
on (src.name = dst.name)
when matched then
update set ord = src.rn
;
How to repeat rows based on column value in snowflake using sql.
I tried a few methods but not working such as dual and connect by.
I have two columns: Id and Quantity.
For each ID, there are different values of Quantity.
So if you have a count, you can use a generator:
with ten_rows as (
select row_number() over (order by null) as rn
from table(generator(ROWCOUNT=>10))
), data(id, count) as (
select * from values
(1,2),
(2,4)
)
SELECT
d.*
,r.rn
from data as d
join ten_rows as r
on d.count >= r.rn
order by 1,3;
ID
COUNT
RN
1
2
1
1
2
2
2
4
1
2
4
2
2
4
3
2
4
4
Ok let's start by generating some data. We will create 10 rows, with a QTY. The QTY will be randomly chosen as 1 or 2.
Next we want to duplicate the rows with a QTY of 2 and leave the QTY =1 as they are.
Obviously you can change all parameters above to suit your needs - this solution works super fast and in my opinion way better than table generation.
Simply stack SPLIT_TO_TABLE(), REPEAT() with a LATERAL() join and voila.
WITH TEN_ROWS AS (SELECT ROW_NUMBER()OVER(ORDER BY NULL)SOME_ID,UNIFORM(1,2,RANDOM())QTY FROM TABLE(GENERATOR(ROWCOUNT=>10)))
SELECT
TEN_ROWS.*
FROM
TEN_ROWS,LATERAL SPLIT_TO_TABLE(REPEAT('hire me $10/hour',QTY-1),'hire me $10/hour')ALTERNATIVE_APPROACH;
I looked at other examples, but I don't know enough about SQL to adapt it to my needs. I have a table that looks like this:
ID Month NAME COUNT First LAST TOTAL
------------------------------------------------------
1 JAN2013 fred 4
2 MAR2013 fred 5
3 APR2014 fred 1
4 JAN2013 Tom 6
5 MAR2014 Tom 1
6 APR2014 Tom 1
This could be in separate queries, but I need 'First' to equal the first month that a particular name is used, so every row with fred would have JAN2013 in the first field for example. I need the 'Last" column to equal the month of the last record of each name, and finally I need the 'total' column to be the sum of all the counts for each name, so in each row that had fred the total would be 10 in this sample data. This is over my head. Can one of you assist?
This is crude but should do the trick. I renamed your fields a bit because you are using a bunch of "RESERVED" sql words and that is bad form.
;WITH cte as
(
Select
[NAME]
,[nmCOUNT]
,ROW_NUMBER() over (partition by NAME order by txtMONTH ASC) as 'FirstMonth'
,ROW_NUMBER() over (partition by NAME order by txtMONTH DESC) as 'LastMonth'
,SUM([nmCOUNT]) as 'TotNameCount'
From Table
Group by NAME, [nmCOUNT]
)
,cteFirst as
(
Select
NAME
,[nmCOUNT]
,[TotNameCount]
,[txtMONTH] as 'ansFirst'
From cte
Where FirstMonth = 1
)
,cteLast as
(
Select
NAME
,[txtMONTH] as 'ansLast'
From cte
Where LastMonth = 1
Select c.NAME, c.nmCount, c.ansFirst, l.ansLast, c.TotNameCount
From cteFirst c
LEFT JOIN cteLast l on c.NAME = l.NAME
How can I transform this table from this
id name
1 sam
2 nick
3 ali
4 farah
5 josef
6 fadi
to
id1 name1 id2 name2 id3 name3 id4 name4
1 sam 2 nick 3 ali 4 farah
5 josef 6 fadi
the reason i need this is i have a database and i need to do a mail merge using word and I want to print every 4 rows on one page, MS word can only print one row per page, so using an SQL query I want one row to represent 4 rows
thanks in advance
Ali
You don't need to create a query for this in Access. Word has a merge field called <<Next Record>> which forces moving to the next record. If you look at how label documents are created using the Mail Merge Wizard, you'll see that's how it's done.
Updated - Doing this in SQL
The columns in simple SELECT statements are derived from the columns from the underlying table/query (or from expressions). If you want to define columns based on the data, you need to use a crosstab query.
First create a query with a running count for each person (say your table is called People), and calculate the row and column position from the running count:
SELECT People.id, Count(*)-1 AS RunningCount, int(RunningCount/4) AS RowNumber, RunningCount Mod 4 AS ColumnNumber
FROM People
LEFT JOIN People AS People_1 ON People.id >= People_1.id
GROUP BY People.id;
(You won't be able to view this in the Query Designer, because the JOIN isn't comparing with = but with >=.)
This query returns the following results:
id Rank RowNumber ColumnNumber
1 0 0 0
2 1 0 1
3 2 0 2
4 3 0 3
5 4 1 0
6 5 1 1
Assuming this query is saved as Positions, the following query will return the results:
TRANSFORM First(Item) AS FirstOfItem
SELECT RowNumber
FROM (
SELECT ID AS Item, RowNumber, "id" &( ColumnNumber + 1) AS ColumnHeading
FROM Positions
UNION ALL SELECT Name, RowNumber, "name" & (ColumnNumber +1)
FROM Positions
INNER JOIN People ON Positions.id = People.id
) AS AllValues
GROUP BY AllValues.RowNumber
PIVOT AllValues.ColumnHeading In ("id1","name1","id2","name2","id3","name3","id4","name4");
The UNION is there so each record in the People table will have two columns - one with the id, and one with the name.
The PIVOT clause forces the columns to the specified order, and not in alphabetical order (e.g. id1, id2 ... name1, name2...)
Correction to my question....
I'm trying to select and sort in a query from a single table. The primary key for the table is a combination of a serialized number and a time/date stamp.
The table's name in the database is "A12", the columns are defined as:
Serial2D (PK, char(25), not null)
Completed (PK, datetime, not null)
Result (smallint, null)
MachineID (FK, smallint, null)
PT_1 (float, null)
PT_2 (float, null)
PT_3 (float, null)
PT_4 (float, null)
Since the primary key for the table is a combination of the "Serial2D" and "Completed", there can be multiple "Serial2D" entries with different values in the "Completed" and "Result" columns. (I did not make this database... I have to work with what I got)
I want to write a query that will utilize the value of the "Result" column ( always a "0" or "1") and retrive only unique rows for each "Serial2D" value. If the "Result" column has a "1" for that row, I want to choose it over any entries with that Serial that has a "0" in the Result column. There should be only one entry in the table that has a Result column entry of "1" for any Serial2D value.
Ex. table
Serial2d Completed Result PT_1 PT_2 PT_3 PT_4
------- ------- ------ ---- ---- ---- ----
A1 1:00AM 0 32.5 20 26 29
A1 1:02AM 0 32.5 10 29 40
A1 1:03AM 1 10 5 4 3
B1 1:04AM 0 29 4 1 9
B1 1:05AM 0 40 3 4 9
C1 1:06AM 1 9 7 6 4
I would like to be able to retrieve would be:
Serial2d Completed Result PT_1 PT_2 PT_3 PT_4
------- ------- ------ ---- ---- ---- ----
A1 1:03AM 1 10 5 4 3
B1 1:05AM 0 40 3 4 9
C1 1:06AM 1 9 7 6 4
I'm new to SQL and I'm still learning ALL the syntax. I'm finding it difficult to search for the correct operators to use since I'm not sure what I need, so please forgive my ignorance. A post with my answer could be staring me right in the face and i wouldn't know it, please just point me to it.
I appreciate the answers to my previous post, but the answers weren't sufficient for me due to MY lack of information and ineptness with SQL. I know this is probably insanely easy for some, but try to remember when you first started SQL... that's where I'm at.
Since you are using SQL Server, you can use Windowing Functions to get this data.
Using a sub-query:
select *
from
(
select *,
row_number() over(partition by serial2d
order by result desc, completed desc) rn
from a12
) x
where rn = 1
See SQL Fiddle with Demo
Or you can use CTE for this query:
;with cte as
(
select *,
row_number() over(partition by serial2d
order by result desc, completed desc) rn
from a12
)
select *
from cte c
where rn = 1;
See SQL Fiddle With Demo
You can group by Serial to get the MAX of each Time.
SELECT Serial, MAX([Time]) AS [Time]
FROM myTable
GROUP BY Serial
HAVING MAX(Result) => 0
SELECT
t.Serial,
max_Result,
MAX([time]) AS max_time
FROM
myTable t inner join
(SELECT
Serial,
MAX([Result]) AS max_Result
FROM
myTable
GROUP BY
Serial) m on
t.serial = m.serial and
t.result = m.max_result
group by
t.serial,
max_Result
This can be solved using a correlated sub-query:
SELECT
T.serial,
T.[time],
0 AS result
FROM tablename T
WHERE
T.result = 1
OR
NOT EXISTS(
SELECT 1
FROM tablename
WHERE
serial = T.serial
AND (
[time] > T.[time]
OR
result = 1
)
)