MySQL - How to Count All Rows Per Table in One Query

Get record counts for all tables in MySQL database

SELECT SUM(TABLE_ROWS) 
     FROM INFORMATION_SCHEMA.TABLES 
     WHERE TABLE_SCHEMA = '{your_db}';

Note from the docs though: For InnoDB tables, the row count is only a rough estimate used in SQL optimization. You'll need to use COUNT(*) for exact counts (which is more expensive).

MySQL - How to count all rows per table in one query

SELECT 
    TABLE_NAME, 
    TABLE_ROWS 
FROM 
    `information_schema`.`tables` 
WHERE 
    `table_schema` = 'YOUR_DB_NAME';

MySQL: Summarize all table row-counts in a single query

The first example code here is a stored procedure which performs the entire process in one step, so far as the user is concerned.

BEGIN

# zgwp_tables_rowcounts
# TableName RowCount
# Outputs a result set listing all tables and their row counts 
# for the current database

SET SESSION group_concat_max_len = 1000000;

SET @sql = NULL;
SET @dbname = DATABASE();

SELECT
  GROUP_CONCAT( 
    CONCAT (
      'SELECT ''',table_name,''' as TableName, COUNT(*) as RowCount FROM ', 
       table_name, ' '
    ) 
    SEPARATOR 'UNION '  
  ) AS Qry
FROM
  information_schema.`TABLES` AS t
WHERE
  t.TABLE_SCHEMA = @dbname AND
  t.TABLE_TYPE = "BASE TABLE"
ORDER BY
  t.TABLE_NAME ASC

INTO @sql
;

PREPARE stmt FROM @sql;

EXECUTE stmt;

END

Notes:

• The SELECT..INTO @sql creates the necessary query, and the PREPARE... EXECUTE runs it.

• Sets the group_concat_max_len variable in order to allow a long enough result string from GROUP_CONCAT.

The above procedure is useful for a quick look in an admin environment like Navicat, or on the command line. However, despite returning a result set, so far as I am aware it can't be referenced in another View or Query, presumably because MySQL is unable to determine, before running it, what result sets it produces, let alone what columns they have.

So, it is still useful to be able to quickly produce, without manual editing, the separate SELECT...UNION statement that can be used as a View. That is useful if you want to join the row counts to some other per-table info from another table. Herewith another stored procedure:

BEGIN

# zgwp_tables_rowcounts_view_statement
# Output: SelectStatement
# Outputs a single row and column, containing a (possibly lengthy)
# SELECT...UNION statement that, if used as a View, will output
# TableName RowCount for all tables in the current database.

SET SESSION group_concat_max_len = 1000000;
SET @dbname = DATABASE();

SELECT
  GROUP_CONCAT( 
    CONCAT (
      'SELECT ''',table_name,''' as TableName, COUNT(*) as RowCount FROM ', 
      table_name, ' ', CHAR(10)) 
    SEPARATOR 'UNION '  
  ) AS SelectStatement
FROM
  information_schema.`TABLES` AS t
WHERE
  t.TABLE_SCHEMA = @dbname AND
  t.TABLE_TYPE = "BASE TABLE"
ORDER BY
  t.TABLE_NAME ASC
;
END

Notes

• Very similar to the first procedure in concept. I added a linebreak (CHAR(10)) to each subsidiary "SELECT...UNION" statement, for convenience in viewing or editing the statement.

• You could create this as a function and return the SelectStatement, if that's more convenient for your environment.

Hope that helps.

How to count rows by some condition in one query?

You can try: select count(*) from table where type is null or type = '';

Exact count of all rows in MySQL database

I think the only accurate (and slower) way is to do for every single table:

SELECT COUNT(*) FROM Table

MYSQL - count number of rows in each table

SELECT table_name, table_rows
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_SCHEMA = '<your db>';

I also hope you realise there's an error in your query: it's missing a FROM.

Count table rows

SELECT COUNT(*) FROM fooTable;

will count the number of rows in the table.

See the reference manual.

How to count rows from two tables in one query?

Use sub-queries and if it needs add FROM DUAL:

SELECT 
    (SELECT COUNT(*) FROM TABLE1) As Table1Count, 
    (SELECT COUNT(*) FROM TABLE2) As Table2Count
[FROM DUAL]

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