Contar registros de todas las tablas

Para contar los registros de todas las tablas de una base de datos podemos usar el siguiente script:

use base de datos

SELECT  [Tables].name                AS [TableName],
        SUM( [Partitions].[rows] )    AS [TotalRowCount]
FROM    sys.tables AS [Tables]
JOIN    sys.partitions AS [Partitions]
    ON  [Tables].[object_id]    =    [Partitions].[object_id]
    AND [Partitions].index_id IN ( 0, 1 )
--WHERE    [Tables].name = N'table name' /* uncomment to look for a specific table */
GROUP BY    [Tables].name;

Fuente: https://riptutorial.com/sql-server