This question already has answers here:
Insert distinct data into Combobox List
(2 answers)
Closed 8 years ago.
I just want to ask if how could i insert distinct values created by my query into a combobox?. I have an employee database that consist of 100 records and 5 different departments.
For the RowSource of your combo box, just add the word "DISTINCT" to your SQL string.
Related
This question already has answers here:
SQL Server dynamic PIVOT query?
(9 answers)
SQL dynamic unpivot table as function
(1 answer)
Closed 2 years ago.
I have table:
I want use UNPIVOT to create table, where CategoryNames rows are columns names.
So, now I can just write this as
SELECT Year, Seafood, Meat/Poultry, [...]
FROM [...] UNPIVOT(...) AS Example
but I don't want write every row manually as column name, so is any option to use
SELECT CategoryName
FROM Pods
query result to create them automatically.
For this example its only 8 row, but with bigger count this could be very helpful.
This question already has answers here:
Exclude a column using SELECT * [except columnA] FROM tableA?
(47 answers)
Closed 5 years ago.
I was reading SQL queries and got stuck with a doubt. Is there any SQL query to exclude a single column while using select statement?
For example, I have a table which contains data about student (s_name, address, email_id, ..... many more).
I want to select all the columns except email_id.
I don't think there is a way to do it directly in a Select statement. But you can use this alternative:
How to select all the columns of a table except one column?
This question already has answers here:
Randomly Select a Row with SQL in Access
(4 answers)
Closed 7 years ago.
I'm trying to make a Query from my Table "Questions", this table has the following fields: id(auto number), Question(text) ; Category(text), difficulty (number)
The query I'm trying to make must return one random row for every difficulty (1-5), for a given Category.
In SQL you can do something like this:
SELECT TOP 1 * FROM Questions ORDER BY NEWID()
This question already has answers here:
How to exclude a column from SELECT query?
(6 answers)
Closed 9 years ago.
I have 20 column in one table, i want to 18 column and remove 2 column,
mysql query is
SELECT col1,col2,col3,..........,col18 from page;
this query is correct, but 18 column is so larger to written, if any query present just remove 2 column???
SQL does not support a syntax to specify columns to exclude. You must do with it and continue to write explicitly all the columns you want to select. You can also SELECT * but it is often considered bad practices.
This question already has answers here:
Fast way to discover the row count of a table in PostgreSQL
(7 answers)
Closed 8 years ago.
What question should I send to database, to check how many rows my table contains?
SELECT COUNT(*) FROM table_name;