How can we concatenate the results of two queries in SQL?

To combine two query results together, you can use the UNION operator.

The syntax is as follows:

SELECT column1, column2, ... FROM table1
UNION
SELECT column1, column2, ... FROM table2;

Table1 and Table2 are two tables, and columns like column1, column2 are the names of the columns to be selected. The results of both queries will be concatenated in the order of the columns to generate a new result set.

It is important to note that the UNION operation requires both queries to have the same number of columns and data types. If they are not the same, the CAST function can be used to convert the data types to match.

For example, if there are two tables, table1 and table2, with the same column names and data types, you can use the following statement to concatenate their query results together:

SELECT column1, column2, ... FROM table1
UNION
SELECT column1, column2, ... FROM table2;

If you need to sort the results, you can use the ORDER BY clause after concatenating.

For example, if you want to sort the results by the value of a column, you can use the following statement:

SELECT column1, column2, ... FROM table1
UNION
SELECT column1, column2, ... FROM table2
ORDER BY column1;

In this way, you can concatenate two query results and sort them by the values in column1.