I have the following simple (i think) requirement:
Have one value lets say '1', then I have a table with one column which has more than one row.
What is the SQL required so that I return two columns, the first column having all values of '1', the second column being the values from the table.
Thanks,
Bruce
select 1 as yourValue, yourField from yourTable
that ?
edit:
Even more, if it's a value coming as parameter (in a variable) you could do the same
select #yourVariable as yourValue, yourField from yourTable
You just need to SELECT the value as a column like so:
SELECT '1', col1, ... FROM tbl
Related
how to
select name,family from student where name="X"
without its column name.
for example :
select "column1","column2" from student where "column1"="x"
or for example
select "1","2" from student where "1"="x"
"1" is column1
"2" is column2
i dont want to say columns name. i want to say just its number or other....
idont tired from select *. but it just for that i dont know the columns name but i know where they are. my columns name are change every i want to read the file but its data are same, and the data are in the same columns in each file.
Although you can not use field positions specifiers in the SELECT statement, the SQL standard includes the INFORMATION_SCHEMA where the dictionary of your tables is defined. This includes the COLUMNS view where all the fields of all tables are defined. And in this view, there is a field called ORDINAL_POSITION which you can use to assist in this problem.
If you query
SELECT ORDINAL_POSITION, COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'TABLE'
ORDER BY ORDINAL_POSITION
then you can obtain the column names for the ordinal positions you want. From there you can prepare a SQL statement.
You could use temp table as:
DECLARE #TB TABLE(Column1 NVARCHAR(50),...)
INSERT #TB
SELECT * FROM student
Then use it:
SELECT Column1 FROM #TB WHERE Column1='aa'
If it's a string you can do this :
Select Column1 + '' From Table
If it's a number you can do this :
Select Column1 + 0 From Table
If it's a datetime you can do this :
Select dateadd(d, 0, Column1) From Table
And similarly for other data types..
No, you can not use the ordinal (numeric) position in the SELECT clause. Only in Order by you can.
however you can make your own column alias...
Select Column1 as [1] From Table
You can use alias:
SELECT name AS [1], family AS [2] FROM student WHERE name="X"
It's just not possible. Unfortunately, they didn't think about table-valued functions, for which information_schema is not available, so good luck with that.
How could I, in SQL Server 2008, write a SQL statement that would insert one row for each distinct value it finds in one column in the same table?
Edit:
The table I want to add rows to the same table I'm checking.
I have normalized table with a column [Name], and [Hobby], so how do I insert one new hobby for each name?
Input greatly appreciated =]
try
INSERT INTO TargetTable (SomeColumn)
SELECT DISTINCT TheSourceColumn From SomeSourceTable;
IF that is not what you are looking for please provide more details like what the data model looks like etc.
UPDATE - after edit from OP:
I am not sure that you data model is good but you can do this:
INSERT INTO TheTable (NAME, HOBBY)
SELECT DISTINCT X.NAME, #SomeHOBBY FROM TheTable X;
You could use something like
Insert into table1
Select distinct col1 from tabl2
The above should work as long as table1 has just one column of the same data type as col1 of tabl2
How do I select only 1 row in sybase without using rowcount? I don't have the privilege to set rowcount in sybase. Is there a way to select only 1 row?
For example:
select * from table where name = 'jack'
This returns two rows; how do I select only one row from the result set without using set rowcount?
Try the query:
SELECT TOP 1 * FROM mytable
WHERE name = 'jack'
As you might guess, this selects the TOP 1 matching results. If you wanted more (which you don't here) you could use any number (TOP 100 or TOP 1000, etc).
A more comprehensive example can be found on w3schools: http://www.w3schools.com/Sql/sql_top.asp
There seems to be a reason, why you're getting more than 1 row for "WHERE name = 'jack'", it looks as if the rows differ.
But if, the rows do not differ you can try adding "distinct":
SELECT DISTINCT * FROM TABLE WHERE name = 'jack'
or try with "GROUP BY" statement, then you should type explicitly all columns, eg.:
SELECT name FROM TABLE WHERE name = 'jack' GROUP BY name
if this is not what you wanted, can you paste here how the 2 rows look exactly?
If you want a single result, use 'GROUP BY' and 'HAVING column = max(column)'. Or replace max() with min().
This should work unless the max or min values are also not unique.
I want to make many inserts in a single SQL statement, pretty much like
INSERT INTO xxx SELECT field FROM zzz
But with values I don't have in a table, and are just a list of literals.
Normal way would be executing one SQL query for each value, but if there exists a standard SQL statement, or MySQL-specific, it would be great.
insert into xxx (fields) values (values1), (values2), (values3)
eg insert into mytable (name, desc) values ('name1','desc1'), ('name2','desc2'), ('name3','desc3'), ('name4','desc4')
insert into xxx(afield)
select 'a'
union
select 'b'
union
select 'x'
will give you a table like that :
afield
a
b
x
Say I have a table that includes column A, column B and column C. How do I write I query that selects all rows where either column A OR column B OR column C equals a certain value? Thanks.
Update: I think forgot to mention my confusion. Say there is another column (column 1) and I need to select based on the following logic:
...where Column1 = '..' AND (ColumnA='..' OR ColumnB='..' OR ColumnC='..')
Is it valid to group statements as I did above with parenthesis to get the desired logic?
Unless I'm missing something here...
SELECT * FROM MYTABLE WHERE COLUMNA=MyValue OR COLUMNB=MyValue OR COLUMNC=MyValue
I prefer this way as its neater
select *
from mytable
where
myvalue in (ColumnA, ColumnB, ColumnC)
SELECT *
FROM myTable
WHERE (Column1 = MyOtherValue) AND
((ColumnA = MyValue) OR (ColumnB = MyValue) OR (ColumnC = MyValue))
Yes, it's valid to use parentheses. However, if you're searching multiple columns for the same value, you may want to consider normalizing the database.