Multiple WHERE conditions in one SQL statement

Question

I am having trouble to use many WHERE conditions, as I do need to combine 8 Where conditions in a single statement.

My current SQL:

SELECT * 
FROM Table 
WHERE ID = ?

I want something like this:

SELECT * 
FROM Table 
WHERE ID = ?, WHERE COL2 = ?, WHERE COL3 = ?, ... WHERE COL8 = ?

How can I achieve this? I'm stuck.

Answer 1

You cannot have multiple WHERE at the same level of SQL query. You need to use AND :

SELECT * FROM Table 
WHERE ID = ? 
  AND COL2 = ? 
  AND COL3 = ?
  -- ... 
  AND COL8 = ?

or use nesting:

SELECT *
FROM (SELECT *
      FROM Table
      WHERE ID = ?) s
WHERE COL1 = ?
...

---

It is actually an interesting question. For instance KQL (Kusto query language) allows to chain multiple WHERE :

 Tab
 | where col = ?
 | where col2 = ?

Sample:

let t1 = datatable(key:long, value:string)  
[1, "a",  
2, "b",
3, "c"];

t1 
| where key in (1,2)
| where value == "b"

Answer 2

We are not allowed to use the multiple where condition in the same statement. For that you need to approach by using and. For example:

SELECT * FROM Table 
where col='a' and col2='c' and col'3' 

This will work perfectly fine.