I have a table as below:- id | columnA | columnB | columnC 1 7234 3432 3245 2 1237 1123 6546 3 4421 9371 7324 4 1244 1424 4237 How can I select …
Tag: select
Query for getting distinct pairs from a single column with an added constraint
How would I go about getting distinct pairs from a column with a constraint that a pair should not be repeated? So I have a query as such This gets me all possible pairs from that column with a constraint that it cannot pair with it self but this can still happen: (1,2) and (2,1). A pair should never be
INNER JOIN is not working, i do not get errors
$result = mysqli_query($conn,”SELECT * FROM table1 INNER JOIN `table2` ON `table1`.`id`=`table2`.`id`;”); while ($row = mysqli_fetch_array($result) ){ echo ‘name ‘.$row[“name”].'<…
Selecting columns from tables based on max value of another column
I have two tables and I want column input from first_table and column output from second_table based on the latest finished time first_table: second_table result_table I am trying to use this query: Answer You can use a correlated subquery in the on clause of the join: For performance here, you want an index …
How to select a record if it is equal to any record of a column from a different table?
I have a table with adresses, which were separated by spaces into different columns. Since the name of the streets can be made up from 1-2-3 etc. parts, the street suffices are placed in different …
SQL Exist in either TableA or TableB
I am attempting to create a script which needs a clause to check of a column value in Table 3 exists in Table 1 or Table 2 Msg 4145, Level 15, State 1, Line 44 An expression of non-boolean type specified in a context where a condition is expected, near ‘)’. Answer Problems with your query: Missing…
Select query in SQL SERVER need to support
I have 3 tables like that: – Employee_Table (Employee_Number, Employee_Name, Department_Number) With Employee_Number is PRIMARY KEY, Department_Number is FOREIGN KEY; – Employee_Skill_Table (…
In MariaDB/MySQL, how do I retrieve the same column from different records returned in a single row?
I would like to retrieve a single row that shows the top three colors of products belonging to a specific set. The order is predefined and for some context, the way I would retrieve the top color is …
SQL select based on column value
We have a DB table that contains company job codes like so: The ‘***’ in company represents an enterprise level job code which can be overwritten at the employer level (DEU, DEC). I need a select statement that returns rows with the following conditions: If there are no company specific Codes (e.g…
Filtering out duplicates yet showing non-duplicate rows from another column in one row
I have a table with multiple duplicate values. What I’d like to do is use some sort of SELECT query that will filter the duplicates by name and yet keep all the appropriate values from the “expertise”…