Query to find which users have priv on a specific database

SET @db_name = 'db_name';
SELECT -- the list of global privileges
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mu.host `host`,
mu.user `user`,
(case when `mu`.`password` ='' then "**Yes**" ELSE 'No' end) as `Empty Password?`,
mu.password as 'password',
'ALL' as `Database`,
'-' as `Tables`,
'-' as `Views`,
'-' as `Tables Columns`,
'-' as `Views Columns`,
'-' as `Procedures`,
'-' as `Functions`,
TRIM(TRAILING ',' FROM(RTRIM(CONCAT(
IF(mu.Select_priv = 'Y', 'Select, ', ''),
IF(mu.Insert_priv = 'Y', 'Insert, ', ''),
IF(mu.Update_priv = 'Y', 'Update, ', ''),
IF(mu.Delete_priv = 'Y', 'Delete, ', ''),
IF(mu.Create_priv = 'Y', 'Create, ', ''),
IF(mu.Drop_priv = 'Y', 'Drop, ', ''),
IF(mu.Reload_priv = 'Y', 'Reload, ', ''),
IF(mu.Shutdown_priv = 'Y', 'Shutdown, ', ''),
IF(mu.Process_priv = 'Y', 'Process, ', ''),
IF(mu.File_priv = 'Y', 'File, ', ''),
IF(mu.Grant_priv = 'Y', 'Grant, ', ''),
IF(mu.References_priv = 'Y', 'References, ', ''),
IF(mu.Index_priv = 'Y', 'Index, ', ''),
IF(mu.Alter_priv = 'Y', 'Alter, ', ''),
IF(mu.Show_db_priv = 'Y', 'SHOW DATABASES, ', ''),
IF(mu.Super_priv = 'Y', 'Super, ', ''),
IF(mu.Create_tmp_table_priv = 'Y', 'CREATE TEMPORARY TABLES, ', ''),
IF(mu.Lock_tables_priv = 'Y', 'LOCK TABLES, ', ''),
IF(mu.Execute_priv = 'Y', 'Execute, ', ''),
IF(mu.Repl_slave_priv = 'Y', 'REPLICATION SLAVE, ', ''),
IF(mu.Repl_client_priv = 'Y', 'REPLICATION CLIENT, ', ''),
IF(mu.Create_view_priv = 'Y', 'CREATE VIEW, ', ''),
IF(mu.Show_view_priv = 'Y', 'SHOW VIEW, ', ''),
IF(mu.Create_routine_priv = 'Y', 'CREATE ROUTINE, ', ''),
IF(mu.Alter_routine_priv = 'Y', 'ALTER ROUTINE, ', ''),
IF(mu.Create_user_priv = 'Y', 'CREATE USER, ', ''),
IF(mu.Event_priv = 'Y', 'Event, ', ''),
IF(mu.Trigger_priv = 'Y', 'Trigger, ', '')
)))) AS `Privileges`
FROM
mysql.user mu
HAVING Privileges <> ''
UNION
SELECT -- the list of privileges for a database
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
md.host `host`,
md.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
md.db `Database`,
'-' as `Tables`,
'-' as `Views`,
'-' as `Tables Columns`,
'-' as `Views Columns`,
'-' as `Procedures`,
'-' as `Functions`,
TRIM(TRAILING ',' FROM(RTRIM(CONCAT(
IF(md.Select_priv = 'Y', 'Select, ', ''),
IF(md.Insert_priv = 'Y', 'Insert, ', ''),
IF(md.Update_priv = 'Y', 'Update, ', ''),
IF(md.Delete_priv = 'Y', 'Delete, ', ''),
IF(md.Create_priv = 'Y', 'Create, ', ''),
IF(md.Drop_priv = 'Y', 'Drop, ', ''),
IF(md.Grant_priv = 'Y', 'Grant, ', ''),
IF(md.References_priv = 'Y', 'References, ', ''),
IF(md.Index_priv = 'Y', 'Index, ', ''),
IF(md.Alter_priv = 'Y', 'Alter, ', ''),
IF(md.Create_tmp_table_priv = 'Y', 'CREATE TEMPORARY TABLES, ', ''),
IF(md.Lock_tables_priv = 'Y', 'LOCK TABLES, ', ''),
IF(md.Create_view_priv = 'Y', 'CREATE VIEW, ', ''),
IF(md.Show_view_priv = 'Y', 'SHOW VIEW, ', ''),
IF(md.Create_routine_priv = 'Y', 'CREATE ROUTINE, ', ''),
IF(md.Alter_routine_priv = 'Y', 'ALTER ROUTINE, ', ''),
IF(md.Execute_priv = 'Y', 'Execute, ', ''),
IF(md.Event_priv = 'Y', 'Event, ', ''),
IF(md.Trigger_priv = 'Y', 'Trigger, ', '')
))))  AS `Privileges`
FROM
mysql.db md
WHERE md.Db = @db_name
UNION
SELECT -- the list of privileges for tables
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mt.host `host`,
mt.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
'-' as `Database`,
CONCAT(mt.Db, '.', mt.Table_name) `Tables`,
'-' as `Views`,
'-' as `Tables Columns`,
'-' as `Views Columns`,
'-' as `Procedures`,
'-' as `Functions`,
REPLACE(mt.Table_priv, ',', ', ') AS `Privileges`
FROM
mysql.tables_priv mt
WHERE mt.Db = @db_name
AND
mt.Table_name IN
(SELECT
DISTINCT
t.table_name `tables`
FROM
information_schema.tables AS t
WHERE
t.table_type IN
('BASE TABLE', 'SYSTEM VIEW', 'TEMPORARY', '') OR
t.table_type <> 'VIEW' AND
t.create_options IS NOT NULL
)
UNION
SELECT -- the list of privileges for views
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mv.host `host`,
mv.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
'-' as `Database`,
'-' as `Tables`,
CONCAT(mv.Db, '.', mv.Table_name) `Views`,
'-' as `Tables Columns`,
'-' as `Views Columns`,
'-' as `Procedures`,
'-' as `Functions`,
REPLACE(mv.Table_priv, ',', ', ') AS `Privileges`
FROM
mysql.tables_priv mv
WHERE
 mv.Db = @db_name
AND
mv.Table_name IN
(SELECT
DISTINCT
v.table_name `views`
FROM
information_schema.views AS v
)
UNION
SELECT -- the list of privileges for table columns
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mtc.host `host`,
mtc.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
'-' as `Database`,
'-' as `Tables`,
'-' as `Views`,
CONCAT(mtc.Db, '.', mtc.Table_name, '.', mtc.Column_name) `Tables Columns`,
'-' as `Views Columns`,
'-' as `Procedures`,
'-' as `Functions`,
REPLACE(mtc.Column_priv, ',', ', ') AS `Privileges`
FROM
mysql.columns_priv mtc
WHERE
 mtc.Db = @db_name
AND mtc.Table_name IN
(SELECT
DISTINCT
t.table_name `tables`
FROM
information_schema.tables AS t
WHERE
t.table_type IN
('BASE TABLE', 'SYSTEM VIEW', 'TEMPORARY', '') OR
t.table_type <> 'VIEW' AND
t.create_options IS NOT NULL
)
UNION
SELECT -- the list of privileges for view columns
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mvc.host `host`,
mvc.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
'-' as `Database`,
'-' as `Tables`,
'-' as `Views`,
'-' as `Tables Columns`,
CONCAT(mvc.Db, '.', mvc.Table_name, '.', mvc.Column_name) `Views Columns`,
'-' as `Procedures`,
'-' as `Functions`,
REPLACE(mvc.Column_priv, ',', ', ') AS `Privileges`
FROM
mysql.columns_priv mvc
WHERE
 mvc.Db = @db_name
AND mvc.Table_name IN
(SELECT
DISTINCT
v.table_name `views`
FROM
information_schema.views AS v
)
UNION
SELECT -- the list of privileges for procedures
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mp.host `host`,
mp.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
'-' as `Database`,
'-' as `Tables`,
'-' as `Views`,
'-' as `Tables Columns`,
'-' as `Views Columns`,
CONCAT(mp.Db, '.', mp.Routine_name) `Procedures`,
'-' as `Functions`,
REPLACE(mp.Proc_priv, ',', ', ') AS `Privileges`
FROM
mysql.procs_priv mp
WHERE
mp.Routine_type = 'PROCEDURE'
AND mp.Db = @db_name
UNION
SELECT -- the list of privileges for functions
@@hostname as server_host,
SUBSTRING(@@version , 1, CHAR_LENGTH(@@version) - 4) as 'database_version',
mf.host `host`,
mf.user `user`,
'-' as `Empty Password?`,
'-' as 'password',
'-' as `Database`,
'-' as `Tables`,
'-' as `Views`,
'-' as `Tables Columns`,
'-' as `Views Columns`,
'-' as `Procedures`,
CONCAT(mf.Db, '.', mf.Routine_name) `Functions`,
REPLACE(mf.Proc_priv, ',', ', ') AS `Privileges`
FROM
mysql.procs_priv mf
WHERE
mf.Routine_type = 'FUNCTION'
AND mf.Db = @db_name