How can I total up 3 select statement count?

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I have three select statements as follows and I would like to sum up total number of records. How can I do that?

SELECT COUNT(*) AS Number FROM tableA where user_id = 5   //Total 5 records
SELECT COUNT(*) AS Number FROM tableB where user_id = 5   //Total 6 records
SELECT COUNT(*) AS Number FROM tableC where user_id = 5   //Total 1 records

so return result will be 12.

You could apply count(*) to the result of a union all:

SELECT COUNT(*)
FROM   (SELECT user_id FROM tablea
        UNION ALL
        SELECT user_id FROM tableb
        UNION ALL
        SELECT user_id FROM tablec) t
WHERE  user_id = 5

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I think this should do the trick:

SELECT SUM(Number)
FROM (
    SELECT COUNT(*) AS Number FROM tableA where user_id = 5
    UNION ALL
    SELECT COUNT(*) AS Number FROM tableB where user_id = 5
    UNION ALL
    SELECT COUNT(*) AS Number FROM tableC where user_id = 5
)

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select ( select count(*) from tableA where user_id = 5 )
     + ( select count(*) from tableB where user_id = 5 ) 
     + ( select count(*) from tableC where user_id = 5 ) 
     as total_rows
from dual

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SQL: COUNT Function, We've aliased the COUNT(*) as total to make our query results more readable. Now, total will display as the column heading when the result set is returned. the following SQL statement can be used: SQL Code: SELECT COUNT( *) as "Number of Rows" FROM orders; Output: Number of Rows ----- 36 SQL COUNT( ) with where clause. The WHERE clause can be used along with SQL COUNT() function to select specific records from a table against a given condition. Example: Sample table: orders

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Return counts for multiple ranges in a single SELECT statement , Just use conditional SUM() statements per column for each number range. select sum(case when score between 0 and 3 then 1 else 0 end) as total adds up low , mid and high , unless NULL or other values are involved. I want to know number of rows that are qualifying the particular criteria for given select statement. I tried the COUNT(*) option which is pretty basic. I worked on GET Diagnostics but it is applied within the procedure only and that too only for insert update and delete statement NOT FOR select Statement.