I have a question regarding a conditional insert.
I want to be able to add the same ID in the ("tafelID" = tableID) column, ONLY if the ("betaalstatus" = pay status) is equal to true. What query do i have to use ?
I'm new to SQL. my query is below.
INSERT INTO Rekening (tafelID, betaalstatus) Select ('7', 'False')
WHERE not exists ( select 'False' )
you can replace "<...>" with the data in the nested select statement in FROM clause. you can use nested Case When statement for complex conditions.
INSERT INTO Rekening (tafelID, betaalstatus)
Select Case WHEN betaalstatus = true THEN tableID ELSE tafelID END tafelID, betaalstatus
FROM (SELECT <betaalstatus> AS betaalstatus, <tableID> AS tableID, <tafelID> AS tafelID)
-- i.e. (SELECT true AS betaalstatus, 7 AS tableID, 8 AS tafelID)
Related
What I want to achieve is to have a switch case in the where clause. I want to test if this statement returns something, if it returns null, use this instead.
Sample:
SELECT [THIS_COLUMN]
FROM [THIS_TABLE]
WHERE (IF THIS [ID] RETURNS NULL THEN DO THIS SUBQUERY)
What I mean is that it will do this query first.
SELECT [THIS_COLUMN]
FROM [THIS_TABLE]
WHERE [ID] = 'SOMETHING'
If this returns NULL, do this query instead:
SELECT [THIS_COLUMN]
FROM [THIS_TABLE]
WHERE ID = (SELECT [SOMETHING] FROM [OTHER_TABLE]
WHERE [SOMETHING_SPECIFIC] = 'SOMETHING SPECIFIC')
Note that the expected results from the intended query varies from 30 rows up to 15k rows. Hope it helps.
Adding more information:
The results for this query will be used for another query but will just focus on this query.
Providing a real case scenario:
[THIS_COLUMN] is expected to have a list of VALUES.
[THIS_TABLE] contains the latest data only(let's say 1 year's worth of data) while the [OTHER_TABLE] contains the historical data.
What I want to achieve is when I query for a data that is not with in the 1 year's worth of data, IE 'SOMETHING' is not with in the 1 year scope(or in my case it returns NULL), I will use the other query where I query the 'SOMETHING_SPECIFIC'(Or may be 'SOMETHING' from the first statement makes more sense) from the historical table.
If I as reading through the lines correctly, this might work:
SELECT THIS_COLUMN
FROM dbo.THIS_TABLE TT
WHERE TT.ID = 'SOMETHING'
OR TT.ID = (SELECT OT.SOMETHING
FROM dbo.OTHER_TABLE OT
WHERE OT.SOMETHING_SPECIFIC = 'SOMETHING SPECIFIC'
AND NOT EXISTS (SELECT 1
FROM dbo.THIS_TABLE sq
WHERE sq.ID = 'SOMETHING'
AND THIS_COLUMN IS NOT NULL))
Note, however, that this could easily not be particularly performant.
You an use union all and not exists:
select this_column
from this_table
where id = 'something'
union all
select this_column
from this_table
where
not exists (select this_column from this_table where id = 'something')
and id = (select something from other_table where something_specific = 'something specific')
The first union member attempts to find rows that match the first condition, while the other one uses the subquery - the not exists prevents the second member to return something if the first member found a match.
90% of the time you can use a query-batch (i.e. a sequence of T-SQL statements) in a single SqlCommand object or SQL Server client session, so with that in-mind you could do this:
DECLARE #foo nvarchar(50) = (
SELECT
[THIS_COLUMN]
FROM
[THIS_TABLE]
WHERE
[ID] = 'SOMETHING'
);
IF #foo IS NULL
BEGIN
SELECT
[THIS_COLUMN]
FROM
[THIS_TABLE]
WHERE
[ID] = (
SELECT
[SOMETHING]
FROM
[OTHER_TABLE]
WHERE
[SOMETHING_SPECIFIC] = 'SOMETHING SPECIFIC'
)
END
ELSE
BEGIN
SELECT #foo AS [THIS_COLUMN];
END
That said, SELECT ... FROM ... WHERE x IN ( SELECT y FROM ... ) is a code-smell in a query - you probably need to rethink your solution entirely.
I'm trying to do an update using data from another table. I've tried this answer (the second part), but it is not working for me. I'm receiving a generic error message of syntax error.
I've also tried this solution and received a syntax error message too.
If I try to update just one column, it works:
UPDATE dogs
SET name =
(
SELECT 'Buddy'
FROM systables
WHERE tabid = 1
);
But I need to update multiples columns. Unfortunately, this is not working:
UPDATE dogs
SET (name, breed) =
(
SELECT 'Buddy', 'pug'
FROM systables
WHERE tabid = 1
);
Informix version is 12.10.FC8
You are missing 1 more set of parentheses around the subquery.
From the Informix manual:
The subquery must be enclosed between parentheses. These parentheses
are nested within the parentheses that immediately follow the equal (
= ) sign. If the expression list includes multiple subqueries, each subquery must be enclosed between parentheses, with a comma ( , )
separating successive subqueries:
UPDATE ... SET ... = ((subqueryA),(subqueryB), ... (subqueryN))
The following examples show the use of subqueries in the SET clause:
UPDATE items
SET (stock_num, manu_code, quantity) =
(
(
SELECT stock_num, manu_code
FROM stock
WHERE description = 'baseball'
),
2
)
WHERE item_num = 1 AND order_num = 1001;
UPDATE table1
SET (col1, col2, col3) =
(
(
SELECT MIN (ship_charge), MAX (ship_charge)
FROM orders
),
'07/01/2007'
)
WHERE col4 = 1001;
So in order for your update to be accepted by Informix it has to be:
UPDATE dogs
SET (name, breed) =
(
(
SELECT 'Buddy', 'pug'
FROM systables
WHERE tabid = 1
)
);
Is it possible to SELECT value of two or more columns with one shot of CASE statement? I mean instead of:
select
ColumnA = case when CheckColumn='condition' then 'result1' end
,ColumnB = case when CheckColumn='condition' then 'result2' end
Something like:
select case when CheckColumn='condition' then ColumnA='result1', ColumnB='result2' end
UPDATE
Just the same as we can do with the UPDATE statement:
update CTE
set ColumnA='result1', ColumnB='result2'
where CheckColumn='condition'
It is not possible with CASE expression.
For every column you need new CASE
It is not possible, but you could use a table value constructor as a work around to this, to store each value for columna and columnb against your check column:
SELECT t.CheckColumn,
v.ColumnA,
v.ColumnB
FROM dbo.YourTable AS t
LEFT JOIN
(VALUES
('Condition1', 'Result1', 'Result2'),
('Condition2', 'Result3', 'Result4'),
('Condition3', 'Result5', 'Result6')
) AS v (CheckColumn, ColumnA, ColumnB)
ON v.CheckColumn = t.CheckColumn;
If you have more complex conditions, then you can still apply this logic, but just use a pseudo-result for the join:
SELECT t.CheckColumn,
v.ColumnA,
v.ColumnB
FROM dbo.YourTable AS t
LEFT JOIN
(VALUES
(1, 'Result1', 'Result2'),
(2, 'Result3', 'Result4'),
(3, 'Result5', 'Result6')
) AS v (ConditionID, ColumnA, ColumnB)
ON v.ConditionID = CASE WHEN <some long expression> THEN 1
WHEN <some other long expression> THEN 2
ELSE 3
END;
The equivalent select to the update is:
select 'result1', 'result2'
. . .
where CheckColumn = 'condition';
Your select is different because it produces NULL values. There is an arcane way you can essentially do this with outer apply:
select t2.*
from . . . outer apply
(select t.*
from (select 'result1' as col1, 'result2' as col2) t
where CheckColumn = 'condition'
) t2;
This will return NULL values when there is no match. And, you can have as many columns as you would like.
What I understood from your question is that you want to update multiple columns if certain condition is true.
For such situation you have to use MERGE statements.
Example of using MERGE is as given on msdn here.
Code example:
-- MERGE statement for update.
USE [Database Name];
GO
MERGE Inventory ity
USING Order ord
ON ity.ProductID = ord.ProductID
WHEN MATCHED THEN
UPDATE
SET ity.Quantity = ity.Quantity - ord.Quantity;
More MERGE statement example here.
You could solve this maybe with a CTE or a CROSS APPLY, somehting like
DECLARE #tbl2 TABLE(inx INT, val1 VARCHAR(10),val2 VARCHAR(10));
INSERT INTO #tbl2 VALUES(1,'value1a','value1b'),(2,'value2a','value2b'),(3,'value2a','value2b');
UPDATE yourTable SET col1=subTable.val1,col2=subTable.val2
FROM yourTable
CROSS APPLY(
SELECT val1,val2
FROM #tbl2
WHERE inx=1 --YourCondition
) AS subTable
I have a sql query that I run against a sql server database eg.
SELECT * FROM MyTable WHERE Id = 2
This may return a number of records or may return none. If it returns none, I would like to alter my sql query to return a default record, is this possible and if so, how? If records are returned, the default record should not be returned. I cannot update the data so will need to alter the sql query for this.
Another way (you would get an empty initial rowset returned);
SELECT * FROM MyTable WHERE Id = 2
IF (##ROWCOUNT = 0)
SELECT ...
SELECT TOP 1 * FROM (
SELECT ID,1 as Flag FROM MyTable WHERE Id = 2
UNION ALL
SELECT 1,2
) qry
ORDER BY qry.Flag ASC
You can have a look to this post. It is similar to what you are asking
Return a value if no rows are found SQL
I hope that it can guide you to the correct path.
if not exists (SELECT top 1 * FROM mytable WHERE id = 2)
select * from mytable where id= 'whatever_the_default_id_is'
else
select * from mytable where id = 2
If you have to return whole rows of data (and not just a single column) and you have to create a single SQL query then do this:
Left join actual table to defaults single-row table
select
coalesce(a.col1, d.col1) as col1,
coalesce(a.col2, d.col2) as col2,
...
from (
-- your defaults record
select
default1 as col1,
default2 as col2,
...) as d
left join actual as a
on ((1 = 1) /* or any actual table "where" conditions */)
The query need to return the same number of fields, so you shouldn't do a SELECT * FROM but a SELECT value FROM if you want to return a default value.
With that in mind
SELECT value FROM MyTable WHERE Id = 2
UNION
SELECT CASE (SELECT count(*) FROM MyTable WHERE Id = 2)
WHEN 0 THEN 'defaultvalue'
END
How can I retrieve the row just inserted?
INSERT INTO LETTRE_VOIT
select rsVoit.NOID, NO_ORDRE, rsOrdre.CODE_DEST, rsOrdre.MODAL_MODE, rsOrdre.MODAL_PORT,
CASE rsOrdre.MODAL_PORT
WHEN 'false' THEN 'D'
ELSE 'P'
END,
rsOrdre.LIVRS_EXPRS,
CASE rsOrdre.LIVRS_EXPRS
WHEN 'false' THEN 'L'
ELSE 'E'
END,
rsOrdre.ENLEV_UNITE, LIBELLE, NBR_COLIS,POID,ENLEV_CREMB,ENLEV_DECL
from ORDRE rsOrdre
inner join
(
select CODE_DEST,MODAL_MODE, MODAL_PORT, LIVRS_EXPRS,ENLEV_UNITE, ROW_NUMBER() over (order by CODE_DEST) as NOID
from ORDRE
group by CODE_DEST,MODAL_MODE,MODAL_PORT,LIVRS_EXPRS,ENLEV_UNITE
) rsVoit on rsVoit.CODE_DEST = rsOrdre.CODE_DEST and rsVoit.MODAL_MODE = rsOrdre.MODAL_MODE
and rsVoit.MODAL_PORT = rsOrdre.MODAL_PORT and rsVoit.LIVRS_EXPRS = rsOrdre.LIVRS_EXPRS
and rsVoit.ENLEV_UNITE = rsOrdre.ENLEV_UNITE
LEFT JOIN T_UNITE ON rsOrdre.ENLEV_UNITE = T_UNITE.NOID
WHERE (STATUT_ORDRE = 3) AND IS_PRINT = 'false' AND (TRANSPORTEUR IN (SELECT ParsedString From dbo.ParseStringList(#Trans)))
order by rsVoit.NOID, NO_ORDRE
SELECT * FROM LETTRE_VOIT WHERE ???
For example:
I inserted 2, it return 2
and then I inserted 3, I want return 3 instead of 5 rows.
Thanks in advance.
Stev
PS: May be I need to use a stored procedure ?
I'm not 100% sure what exactly you want back.... but SQL Server has an OUTPUT clause that can output stuff from INSERT and UPDATE and DELETE statements:
INSERT INTO dbo.YourTable(col1, col2, ..., colN)
OUTPUT Inserted.Col1, Inserted.IDCol, Inserted.Col17
VALUES(val1, val2, ...., valN)
Here, you're inserting values and the inserted values for the IDCol (e.g. an INT IDENTITY column), Col1 and Col17.
If just getting back the results into your grid in Mgmt Studio is good enough - then use the OUTPUT clause! Read more about the OUTPUT clause on Books Online
If you are using SQL Server
And you know how many row inserted then go through
SELECT top 2 * FROM LETTRE_VOIT order by primaryKeyId desc
put the number of row inserted at place of 2.
It may be help you, If you know the number of inserted rows, and then you can provide the numbers with top keyword
How about saving the records in a variable before inserting them or adding a date field and retrieve them by date?