I have different databases. I have tables within each database.
I would like to know if I can ask how many databases excluding some such as 'schema' 'mysql' I have once know how to perform a subquery asked by a particular table of all the databases resulting from the first question.
example.
the structure would be
db1 -> user-> id,name,imei,telephone,etc..
db2 -> user-> id,nameuser,imei,telephone,etc..
db3 -> user-> id,nameuser,imei,telephone,etc..
....
db1000 -> user-> id,nameuser,imei,telephone,etc..
the query are how this, but this get error
SELECT CONCAT('SELECT * FROM ' schema_name 'where imei.'schema_name = nameimai)
FROM information_schema.schemata
WHERE schema_name NOT IN ('information_schema','mysql','performance_schema','sys','performance_schema','phpmyadmin');
Results
name db id name imei phone
---------- ---------- ---------- ---------- ----------
db1 1 John 76876876 xxx
db2 2300 John 76876876 xxxx
...
db1000 45 John 76876876 xxx
its possible in one query
thanks..
Here's one way you could do it with a stored procedure.
If I understand correctly, you have multiple databases with identical tables (user) and you want to run a query against all these tables for a specific value.
I've made this fairly general so that you can pass in the table name and also the where clause. Your example seemed to be looking for user records with imei = '76876876', so if we use that example.
USE test;
DELIMITER //
DROP PROCEDURE IF EXISTS multidb_select //
-- escape any quotes in the query string
-- call multidb_select ('usertest','WHERE imei = \'76876876\'')
CREATE PROCEDURE multidb_select(IN tname VARCHAR(64), IN qwhere VARCHAR(1024))
READS SQL DATA
BEGIN
DECLARE vtable_schema VARCHAR(64);
DECLARE vtable_name VARCHAR(64);
DECLARE done BOOLEAN DEFAULT FALSE;
-- exclude views and system tables
DECLARE cur1 CURSOR FOR
SELECT `table_schema`, `table_name`
FROM `information_schema`.`tables`
WHERE `table_name` = tname
AND `table_type` = 'BASE TABLE'
AND `table_schema` NOT IN
('information_schema','mysql','performance_schema',
'sys','performance_schema','phpmyadmin')
ORDER BY `table_schema` ASC;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done := TRUE;
OPEN cur1;
SET #unionall := '';
read_loop: LOOP
FETCH cur1 INTO vtable_schema, vtable_name;
IF done THEN
LEAVE read_loop;
END IF;
-- UNION ALL in case the id is the same
IF CHAR_LENGTH(#unionall) = 0 THEN
SET #unionall =
CONCAT("SELECT \'", vtable_schema , "\' AS 'Db', t.* FROM `",
vtable_schema, "`.`" , vtable_name, "` t ", qwhere);
ELSE
SET #unionall =
CONCAT(#unionall, " UNION ALL SELECT \'", vtable_schema ,
"\' AS 'Db', t.* FROM `", vtable_schema,
"`.`", vtable_name, "` t ", qwhere);
END IF;
END LOOP;
CLOSE cur1;
PREPARE stmt FROM #unionall;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END //
DELIMITER ;
Run it with
call test.multidb_select('user','WHERE imei = \'76876876\'')
Related
i have i would like to create a join over several tables.
table login : I would like to retrieve all the data from login
table logging : calculating the Nb_of_sessions for each db & for each a specific event type by user
table meeting : calculating the Nb_of_meetings for each db & for each user
table live : calculating the Nb_of_live for each db & for each user
I have those queries with the right results :
SELECT db.id,_id as userid,firstname,lastname
FROM "logins"."login",
UNNEST(dbs) AS a1 (db)
SELECT dbid,userid,count(distinct(sessionid)) as no_of_visits,
array_join(array_agg(value.from_url),',') as from_url
FROM "loggings"."logging"
where event='url_event'
group by db.id,userid;
SELECT dbid,userid AS userid,count(*) as nb_interviews,
array_join(array_agg(interviewer),',') as interviewer
FROM "meetings"."meeting"
group by dbid,userid;
SELECT dbid,r1.user._id AS userid,count(_id) as nb_chat
FROM "lives"."live",
UNNEST(users) AS r1 (user)
group by dbid,r1.user._id;
But when i begin to try put it all together, it seems i retrieve bad data (i have only on db retrieved) and it seems not efficient.
select a1.db.id,a._id as userid,a.firstname,a.lastname,count(rl._id) as nb_chat
FROM
"logins"."login" a,
"loggings"."logging" b,
"meetings"."meeting" c,
"lives"."live" d,
UNNEST(dbs) AS a1 (db),
UNNEST(users) AS r1 (user)
where a._id = b.userid AND a._id = c.userid AND a._id = r1.user._id
group by 1,2,3,4
Do you have an idea ?
Regards.
The easiest way is to work with with to structure the subquery and then reference them.
with parameter reference:
You can use WITH to flatten nested queries, or to simplify subqueries.
The WITH clause precedes the SELECT list in a query and defines one or
more subqueries for use within the SELECT query.
Each subquery defines a temporary table, similar to a view definition,
which you can reference in the FROM clause. The tables are used only
when the query runs.
Since you already have working sub queries, the following should work:
with logins as
(
SELECT db.id,_id as userid,firstname,lastname
FROM "logins"."login",
UNNEST(dbs) AS a1 (db)
)
,visits as
(
SELECT dbid,userid,count(distinct(sessionid)) as no_of_visits,
array_join(array_agg(value.from_url),',') as from_url
FROM "loggings"."logging"
where event='url_event'
group by db.id,userid
)
,meetings as
(
SELECT dbid,userid AS userid,count(*) as nb_interviews,
array_join(array_agg(interviewer),',') as interviewer
FROM "meetings"."meeting"
group by dbid,userid
)
,chats as
(
SELECT dbid,r1.user._id AS userid,count(_id) as nb_chat
FROM "lives"."live",
UNNEST(users) AS r1 (user)
group by dbid,r1.user._id
)
select *
from logins l
left join visits v
on l.dbid = v.dbid
and l.userid = v.userid
left join meetings m
on l.dbid = m.dbid
and l.userid = m.userid
left join chats c
on l.dbid = c.dbid
and l.userid = c.userid;
I have a stored procedure in AZURE SQL database.In that there is a requirement to insert the records into the remote table from #temp table.
As xxxx_table is in the remote database used sp_execute_remote.
below is the scenario:
Create Procedure SP1 parameter1, Parameter2
As
select Distinct B.column1, B.Column2
into #A
from (Query1
Union
Query2) B
if (select count(1) from #A) > 0
Begin
Exec sp_execute_remote #data_source_name = N'Remotedatabase',
#stmt = N'INSERT INTO [dbo].[xxxx_table]
SELECT DISTINCT
'xxx' AS 'column1',
'xxx as 'Column2',
'xxx' AS 'Column3',
'xxx' AS 'Column4',
'xxx' AS Column4
FROM #A A INNER JOIN table1 on A.Column1 = Table1.Column2'
End
)
Getting the syntax error as below:
Incorrect syntax near 'xxx'.
Where am i going wrong? or let me know if there is another way to achieve this.
If you need to dynamically build a string in SQL single-quote the whole sentence, or use 'some text' + 'another text' to concat sentences. If you must add single quote use a double single quote ''
Example:
DECLARE #param1 int;
DECLARE #param1 VARCHAR(10);
SET #param1 = 10;
SET #param2 = 'CCDOS87'
#Stmt = 'SELECT Field1 FROM TableName WHERE Field1 = '
+ CAST(#param1 AS VARCHAR(100))
+ ' AND Field1 = '''
+ param2
+ ''''; <- This is a single '
#stmt = N'INSERT INTO [dbo].[Error_table]
SELECT DISTINCT
xxx AS column1,
xxx as Column2,
xxx AS Column3,
xxx AS Column4,
xxx AS Environment
FROM #A A INNER JOIN table1 on A.Column1 = Table1.Column2'
update
If your tables are in different databases but in the same server use:
INSERT INTO SERVER.SCHEMA.TABLE_NAME
SELECT Something
FROM SERVER.SCHEMA.TABLE_NAME
How do I increment field of table using varchar. Here an example of what I want to have:
Mark 00001
Mark 00002
Mark 00003
Jaques 00001
Jaques 00002
Jaques 00003
Here is my example It can be useful for other people thanks to those who have helped me a lot thank you
The table is
`CREATE TABLE [dbo].[TAG_Sinistre](
[ID] [int] IDENTITY(1,1) NOT NULL,
[ref_ag] [varchar](7) NULL,
[ref_sinistre] [varchar](7) NULL,
)`
The stored procedure is
create PROC [dbo].[sp_Add_AgSinistre]
#ref_ag varchar (7)
AS BEGIN
declare #id int
DECLARE #ref_sin VARCHAR
SET #id = (SELECT ISNULL(MAX(CAST(ID AS INT)), 0) + 1
FROM TAG_Sinistre where ref_ag=#ref_ag
)
select #ref_sin=right('000000'+CAST(#ref_sin AS VARCHAR(6)),6)
BEGIN
INSERT into TAG_Sinistre(ref_ag,ref_sinistre)
VALUES (#ref_ag,#ref_sin)
Assuming the CompanyName field is UNIQUE, you could get the MAX added value, and increment that?
DECLARE #CurrentSequence INT
SET #CurrentSequence = (SELECT MAX(SequenceId)
FROM TableName WHERE CompanyName = #CompanyName)
INSERT INTO TableName
(CompanyName, SequenceId)
VALUES
(#CompanyName, #CurrentSequence+1)
Your StoredProc would pass in the Company Name as #CompanyName. Obviously, this is a naive approach, and I'm not including what would happen if multiple attempts to update the company would happen simultaneously, but there's no mention of that ion the question.
EDIT: Based on comments
DECLARE #maxSeq INT
SET #maxSeq = (SELECT ISNULL(MAX(CAST(SequenceId AS INT)), 0) + 1 FROM
TableName WHERE CompanyName = #CompanyName)
INSERT INTO TableName
(CompanyName, SequenceId)
VALUES
(#CompanyName, right('000000'+CAST(#maxSeq AS VARCHAR(7)),7))
As I said, I would look to use an INT, and get the UI to present the sequence as you want, instead of casting etc in the DB.
EDIT 2: Added Fiddle
SQL Fiddle
Assuming that your columns always look like those specified above.
DB Trigger (MS-SQL) --> Pseudocode/Untested:
CREATE TRIGGER [dbo].[YourTrigger]
ON [dbo].[YourTable]
INSTEAD OF INSERT
AS
BEGIN
DECLARE #maxVal int
-- PSEUDOCODE!!!
SELECT #maxVal = MAX(CAST(dbo.RegexReplace( '.*?(\d+)', myColumn, '$1') AS INT ))
FROM YourTable
INSERT INTO YourTable
SELECT myColumn + ' ' + #maxVal FROM inserted
END
Use insert now like this:
INSERT INTO YourTable values('Jaques')
What is the best way to completely drop all tables in a database in Sybase ASE without dropping the database? I have been using a script: from this question but I am getting errors trying to drop all tables in a database due to referential integrity.
In MySQL I could use SET FOREIGN_KEY_CHECKS = 0
Is there a way to do this in Sybase ASE or can the script above be extended to loop through the constraints?
First you have to drop constraints:
declare cur cursor
for
select SOR.Name as constraint, SOT.Name as table
from sysreferences SR
join sysobjects SOR on SOR.id = SR.constrid
join sysconstraints SC on SC.constrid = SR.constrid
join sysobjects SOT on SOT.id = SC.tableid
go
declare #constraint varchar(500)
declare #table varchar(500)
declare #SQL varchar(500)
open cur
fetch cur into #constraint,#table
while (##sqlstatus = 0)
begin
select #SQL = 'alter table '+#table+' drop '+#constraint
exec( #SQL)
fetch cur into #constraint,#table
end
close cur
deallocate cursor cur
next you can drop tables.
The procedure to drop all constraints in the accepted answer did not work for me. Here is a modified version which works in my ASE16.
BEGIN
declare cur cursor
for
select o.name, t.name from sysreferences r
join sysobjects o on o.id = r.constrid
join sysconstraints c on c.constrid = r.constrid
join sysobjects t on t.id = c.tableid
END
GO
--
declare #constraint varchar(500)
declare #table varchar(500)
declare #SQL varchar(500)
--
open cur
fetch cur into #constraint,#table
while (##sqlstatus = 0)
begin
--
select #SQL = 'alter table '+#table+' drop constraint '+#constraint
exec( #SQL)
fetch cur into #constraint,#table
--
end
close cur
deallocate cursor cur
the above logic is correct but the query is wrong and you might get issues with the "constraint" and "table" keywords.
use something like constriantName and tableName in line 3
The query is missing "constraint", correct query:
'alter table ' + #table + ' drop constraint ' +#constraint
I've this kind of delete query:
DELETE
FROM SLAVE_TABLE
WHERE ITEM_ID NOT IN (SELECT ITEM_ID FROM MASTER_TABLE)
Are there any way to optimize this?
You can use EXECUTE BLOCK for sequential scanning of detail table and deleting records where no master record is matched.
EXECUTE BLOCK
AS
DECLARE VARIABLE C CURSOR FOR
(SELECT d.id
FROM detail d LEFT JOIN master m
ON d.master_id = m.id
WHERE m.id IS NULL);
DECLARE VARIABLE I INTEGER;
BEGIN
OPEN C;
WHILE (1 = 1) DO
BEGIN
FETCH C INTO :I;
IF(ROW_COUNT = 0)THEN
LEAVE;
DELETE FROM detail WHERE id = :I;
END
CLOSE C;
END
(NOT) IN can usually be optimized by using (NOT) EXISTS instead.
DELETE
FROM SLAVE_TABLE
WHERE NOT EXISTS (SELECT 1 FROM MASTER_TABLE M WHERE M.ITEM_ID = ITEM_ID)
I am not sure what you are trying to do here, but to me this query indicates that you should be using foreign keys to enforce these kind of constraints, not run queries to cleanup the mess afterwards.