I am looking to insert some values into a column based on the selection of a specific row. I have a table with columns a, b, c, and d. I want to insert the values 1, 2, and 3 into columns b, c, and d when column a = X. I cannot find how to do this.
Toad for oracle is my platform and I am looking for SQL code.
You can either update them one at a time:
update mytable set b = 1 where a = X;
update mytable set c = 2 where a = X;
update mytable set d = 3 where a = X;
Or update them all in one go:
update mytable set b = 1,c = 2,d = 3 where a = X;
Alternatively, assuming 'a' is a primary key column or unique index and there is only 1 row where a = X, if you only have 4 columns and you want to update 3 of them you could delete your row and re-insert the whole lot:
delete from mytable where a = X;
insert into mytable values(X, 1, 2, 3);
update mytable set b = 1,c = 2,d = 3 where a = X;
You can use INSERT INTO...SELECT and give condition to your insert queries such as:
INSERT
INTO table_name (b, c, d)
VALUES (bValue, cValue, dValue)
/* Select Condition */
WHERE a=1
Related
So i have a union query like:
select count(id)
from table 1
where membernumber = 'x'
and castnumber = 'y'
union
select count(id)
from table 1
where membernumber = 'x'
and castnumber = 'y'
union
etc...
There will be over 200 unions coming from a list 2x 200 table with values for x and y in each row. So each union query has to get the value of x and y from the corresponding row (not in any particular order).
How can i achieve that ?
Thanks
Try this:
DECLARE GLOBAL TEMPORARY TABLE
SESSION.PARAMETERS
(
MEMBERNUMBER INT
, CASTNUMBER INT
) DEFINITION ONLY WITH REPLACE
ON COMMIT PRESERVE ROWS NOT LOGGED;
-- Insert all the the constants in your application with
INSERT INTO SESSION.PARAMETERS
(MEMBERNUMBER, CASTNUMBER)
VALUES (?, ?);
-- I don't know the meaning of the result you want to get
-- but it's equivalent
select distinct count(t.id)
from table1 t
join session.parameters p
on p.membernumber = t.membernumber
and p.castnumber = t.castnumber
group by t.membernumber, t.castnumber;
You have parameters x,y,z stored as key values.
You want to execute an expression z=x+y on those parameters. Expression is stored in another table.
You want to generate an SQL query as simply as possible from the expression.
How can you view those parameter values as a single row with columns (x,y,z) to enable execution of the expression ?
SELECT *
INTO #key_values
FROM
(
SELECT 'x' AS mykey, 2 AS myvalue
UNION ALL
SELECT 'y', 5
UNION ALL
SELECT 'z', 0
) a;
This screams for a PIVOT operator:
;WITH Inputs AS
(
SELECT 'x' AS mykey, 2 AS myvalue
UNION ALL
SELECT 'y', 5
UNION ALL
SELECT 'z', 0
)
SELECT
U.x,
U.y,
U.z,
Result = U.x + U.y
FROM
Inputs AS I
PIVOT (
MAX(I.myvalue) FOR I.mykey IN (x, y, z)
) AS U
Results:
x y z Result
2 5 0 7
You can build any expression you want with the pivoted columns in the SELECT.
If you want to update the z record, you will have to join back to the underlying table since after applying the PIVOT you lose access to original table.
IF OBJECT_ID('tempdb..#Input') IS NOT NULL
DROP TABLE #Input
CREATE TABLE #Input (
mykey VARCHAR(10),
myvalue INT)
INSERT INTO #Input (
mykey,
myvalue)
VALUES
('x', 2),
('y', 5),
('z', 0)
UPDATE I SET
myvalue = R.Result
FROM
#Input AS I
CROSS APPLY (
SELECT
Result = x + y
FROM
#Input AS I
PIVOT (MAX(I.myvalue) FOR I.mykey IN (x, y, z)) AS U
) AS R
WHERE
I.mykey = 'z'
Turn the 3 rows into a single 3 column row using a common table expression and update it to run the expression. So the proposed solution is an updatable cte.
WITH myvalues(x,y,z) AS (
SELECT x.myvalue, y.myvalue, z.myvalue
FROM #key_values AS x
JOIN #key_values AS y ON y.mykey='y' AND x.mykey='x'
JOIN #key_values AS z ON z.mykey='z'
)
UPDATE myvalues SET z=x+y;
SELECT myvalue FROM #key_values WHERE mykey='z';
CREATE TABLE (
A INT NOT NULL,
B INT NOT NULL
)
A is an enumerated values of 1, 2, 3, 4, 5
B can be any values
I would like to count() the number of occurrence group by B, with a specific subset of A e.g. {1, 2}
Example:
A B
1 7 *
2 7 *
3 7
1 8 *
2 8 *
1 9
3 9
When B = 7, A = 1, 2, 3. Good
When B = 8, A = 1, 2. Good
When B = 9, A = 1, 3. Not satisfy, 2 is missing
So the count will be 2 (when B = 7 and 8)
If I've understood you correctly, we want to find B values for which we have both a 1 and a 2 in A, and then we want to know how many of those we have.
This query does this:
declare #t table (A int not null, B int not null)
insert into #t(A,B) values
(1,7),
(2,7),
(3,7),
(1,8),
(2,8),
(1,9),
(3,9)
select COUNT(DISTINCT B) from (
select B
from #t
where A in (1,2)
group by B
having COUNT(DISTINCT A) = 2
) t
One or both of the DISTINCTs may be unnecessary - it depends on whether your data can contain repeating values.
If I understand correctly and the requirement is to find Bs with a series of As that doesn't have any "gaps", you could compare the difference between the minimal and maximal A with number of records (per B, of course):
SELECT b
FROM mytable
GROUP BY b
HAVING COUNT(*) + 1 = MAX(a) - MIN(a)
SELECT COUNT(DISTINCT B) FROM TEMP T WHERE T.B NOT IN
(SELECT B FROM
(SELECT B,A,
LAG (A,1) OVER (PARTITION BY B ORDER BY A) AS PRE_A
FROM Temp) K
WHERE K.PRE_A IS NOT NULL AND K.A<>K.PRE_A+1);
I need to write a write a SQL query that selects values from a table based on several tuples of selection criteria. It could be done using a where clause like this :
where (a = 1 and b='a') or (a=5 and b='s')
Is the best way to select:
select a, pk from x where a in (1,5)
select b, pk from x where b in ('a','s')
and join the result of the two queries using the primary key?
do you mean something(a self join) like this:
select x.a, x.pk
from x
join x x2 on x.pk=x2.pk
where x.a in (1,5)
and x2.b in ('a','s')
?
You can use join on table expression from VALUES. You can add in VALUES as much rows as you want. It will work on MSSQL:
DECLARE #x TABLE ( a INT, b CHAR(1) )
INSERT INTO #x
VALUES ( 1, 'a' ),
( 1, 'b' ),
( 1, 'c' ),
( 2, 'd' ),
( 2, 'e' ),
( 5, 'f' ),
( 5, 's' )
SELECT x.*
FROM #x x
JOIN (
VALUES ( 1, 'a'),
( 5, 's')
) AS v( a, b ) ON x.a = v.a AND x.b = v.b
Output:
a b
1 a
5 s
Based on my understanding you want write a SQL that uses a combination of two filters. Here is a simple solution that will work in any database.
Create a new column say "COLUMN_NEW" in the same table or build a temp table or a view with a new column (plus existing columns from original table).
Insert concatenated values of column a and column b in "COLUMN_NEW". Based on the example mentioned by you values in "COLUMN_NEW" will be "1a" and "5s"
Now you may have a different syntax for concat in different databases. Example concat(a,b) in SQL server.
SQL to select records from the table will be select * from table where COLUMN_NEW in ("1a",5s");
I've searched around for an answer and it seems definitive but I figured I would double check with the Stack Overflow community:
Here's what I'm trying to do:
INSERT INTO my_table VALUES (a, b, c)
RETURNING (SELECT x, y, z FROM x_table, y_table, z_table
WHERE xid = a AND yid = b AND zid = c)
I get an error telling me I can't return more than one column.
It works if I tell it SELECT x FROM x_table WHERE xid = a.
Is this at all possible in a single query as opposed to creating a seperate SELECT query?
I'm using PostgreSQL 8.3.
Try this.
with aaa as (
INSERT INTO my_table VALUES(a, b, c)
RETURNING a, b, c)
SELECT x, y, z FROM x_table, y_table, z_table
WHERE xid = (select a from aaa)
AND yid = (select b from aaa)
AND zid = (select c from aaa);
In 9.3 similar query works.
#corvinusz answer was wrong for 8.3 but gave me a great idea that worked so thanks!
INSERT INTO my_table VALUES (a, b, c)
RETURNING (SELECT x FROM x_table WHERE xid = a),
(SELECT y FROM y_table WHERE yid = b),
(SELECT z FROM z_table WHERE zid = c)
I have no idea why the way it's stated in the question is invalid but at least this works.
I found this approach (within a function!)
DO $$
DECLARE
returner_ID int;
returner_Name text;
returner_Age int;
BEGIN
INSERT INTO schema.table
("ID", "Name", "Age")
VALUES
('1', 'Steven Grant', '30')
RETURNING
"ID",
"Name",
"Age"
INTO
returner_ID,
returner_Name,
returner_Ag
END; $$