I'm trying to print out Tables from the DB that have the EntityId column equals to DataclassId column here is the code
public void getRootTables_checkSP()
{
string connect = "Data Source= EUADEVS06\\SS2008;Initial Catalog=TacOps_4_0_0_4_test;integrated security=SSPI; persist security info=False;Trusted_Connection=Yes";
SqlDataReader rootTables_List = null;
SqlConnection conn = new SqlConnection(connect);
conn.Open();
SqlCommand s_cmd = new SqlCommand("SELECT * FROM sys.Tables WHERE EntityId = DataclassId", conn);
rootTables_List = s_cmd.ExecuteReader();
while (rootTables_List.Read())
{
string test = rootTables_List[0].ToString();
Console.WriteLine("ROOT TABLES ARE {0}", test);
}
rootTables_List.Close();
conn.Close();
}
but it keeps saying that these columns are invalid though when I printed out all the columns in the DB "syscolumns" they were there...
Can anyone tell me why I'm getting such an error?
EDIT
What I really want is to query the db TacOps_4_0_0_4_test not the system. I just realized that
EDIT 2
Here is an example of the Tables in my DB
Table_1
ID Sequence Type Heigh Weight EntityId DataclassId
0 1 s 1.4 2.5 42-2c-Qi 42-2c-Qi
1 2 s 2.4 2.5 zh-km-xd zh-km-xd
2 3 s 3.4 2.5 8n-tr-l7 8n-tr-l7
Table_2
ID Data Person EntityId DataclassId
0 1 Dave 58-zj-4o 41-2c-Q7
1 2 Sara 99-op-t6 oy-7j-mf
2 3 Silve 75-qy-47 2d-74-ds
Table_3
ID Name Genre EntityId DataclassId
0 LR Ac 78-jd-o9 78-jd-o9
1 OI Dr 4t-jb-qj 4t-jb-qj
2 DH Do 7j-3e-ol 7j-3e-ol
The output should be
Table_1
Table_3
EntityId and DataclassId are indeed no columns that exists in the sys.tables.
You're selecting data from sys.tables, there's no notion of syscolumns in your query, so i do not know why you're mentionning 'syscolumns' in your explanation ?
I think I may understand what you're trying now based on your comment to Frederik's answer
I tried "syscolumns" just to make sure
that the columns do exist. But when I
do the query where EntityId =
DataclassId it says "Invalid column
name
It sounds like EntityId and Dataclassid are columns in a table (or tables) that you have in your database and you want to find the rows from those tables that contain the same value in both those columns??
If that's the case, you are querying sys.Tables incorrectly - you'd need to query the specific tables directly i.e.
SELECT * FROM Table1 WHERE EntityId = DataClassId
Can you clarify?
Edit:
You can find all the tables that contain both those columns using this:
SELECT t.name
FROM sys.tables t
WHERE EXISTS(SELECT * FROM sys.columns c WHERE c.object_id = t.object_id AND c.name='EntityId')
AND EXISTS(SELECT * FROM sys.columns c WHERE c.object_id = t.object_id AND c.name='DataClassId')
From this, you could either iterate round each table and run the query to find rows that match on EntityId/DataClassId values - could insert into a temp table and return 1 resultset at the end.
OR, you could create a view to UNION all the tables together and then query that view (would need to update the view each time you added a new table).
OR, you could do some dynamic SQL generation based on the above to generate a SELECT statement on-the-fly to UNION all the tables together.
Update:
Here's a generic way to do it in pure TSQL - this way means if new tables are added it will automatically include them:
DECLARE #SQL VARCHAR(MAX)
SELECT #SQL = COALESCE(#SQL + CHAR(10) + 'UNION ALL' + CHAR(10), '')
+ 'SELECT ''' + REPLACE(QUOTENAME(t.Name), '''', '''''') + ''' AS TableName, COUNT(*) AS RowsMatched FROM ' + QUOTENAME(t.name)
+ ' WHERE EntityId = DataClassId'
FROM sys.tables t
WHERE EXISTS(SELECT * FROM sys.columns c WHERE c.object_id = t.object_id AND c.name='EntityId')
AND EXISTS(SELECT * FROM sys.columns c WHERE c.object_id = t.object_id AND c.name='DataClassId')
SET #SQL = 'SELECT x.TableName, x.RowsMatched FROM (' + #SQL + ') x WHERE x.RowsMatched > 0 ORDER BY x.TableName'
EXECUTE(#SQL)
If you don't need it to be dynamic, change the above EXECUTE to a PRINT to see the SQL it generates, and then create a view from it. You can then SELECT from that view.
Of course, you could either loop round each table 1 by 1 as you are trying.
Based on all the comments, i think what you might be trying to find is ALL tables in your database that have both EntityID and DataClassID columns.
I know...its a pretty WILD guess but dont blame me for trying!! :-)
If my shot in the pretty awesome darkness that is your question is correct, try this out:
SELECT tabs.name
FROM sys.tables tabs INNER JOIN sys.columns cols
ON tabs.object_id = cols.object_id
AND cols.name IN ('EntityId', 'DataClassId')
Well, if you do a sp_help 'sys.Tables' in SQL Management Studio you'll see that, indeed, those columns are not part of sys.Tables...
Related
I have 7 tables and each table will contain an entry for a particular product.I want to check whether all 7 tables contains entry for a particular ID(eg: 4562). ie, data exists or not.I am using SQL server 2008.Please help me to write a query to check the status.
Try the following command (example for 3 tables T1,T2,T3). It returns 1 if ID = 4562 exists in ALL tables and 0 if at least one table miss this ID.
SELECT
CASE WHEN
(
EXISTS(SELECT ID FROM T1 WHERE ID=4562)
AND EXISTS(SELECT ID FROM T2 WHERE ID=4562)
AND EXISTS(SELECT ID FROM T3 WHERE ID=4562)
)
THEN 1
ELSE 0
END AS [ID_Exists_in_all_tables]
SQLFiddle demo
If you do a basic join rather than left join, the product will only appear if it's in all of the tables.
select * from tab1
join tab2 on tab2.id = tab1.id
join tab3 on tab3.id = tab1.id
join tab4 on tab4.id = tab1.id
join tab5 on tab5.id = tab1.id
Where tab1.id = 1234
etc etc
I am generating a report in php (mysql),
ex:
`select count(id) as tot_user from user_table
select count(id) as tot_cat from cat_table
select count(id) as tot_course from course_table`
Like this I have 12 tables.
Can i make it in single query. If i did? Process gets slow?
SELECT (
SELECT COUNT(*)
FROM user_table
) AS tot_user,
(
SELECT COUNT(*)
FROM cat_table
) AS tot_cat,
(
SELECT COUNT(*)
FROM course_table
) AS tot_course
If you use MyISAM tables, the fastest way is querying directly the stats:
select table_name, table_rows
from information_schema.tables
where
table_schema='databasename' and
table_name in ('user_table','cat_table','course_table')
If you have InnoDB you have to query with count() as the reported value in information_schema.tables is wrong.
You can certainly us the a Select Agregation statement as Postulated by Ben James, However This will result in a view with as many columns as you have tables. An alternate method may be as follows:
SELECT COUNT(user_table.id) AS TableCount,'user_table' AS TableSource FROM user_table
UNION SELECT COUNT(cat_table.id) AS TableCount,'cat_table' AS TableSource FROM cat_table
UNION SELECT COUNT(course_table.id) AS TableCount, 'course_table' AS TableSource From course_table;
The Nice thing about an approch like this is that you can explicitly write the Union statements and generate a view or create a temp table to hold values that are added consecutively from a Proc cals using variables in place of your table names. I tend to go more with the latter, but it really depends on personal preference and application. If you are sure the tables will never change, you want the data in a single row format, and you will not be adding tables. stick with Ben James' solution. Otherwise I'd advise flexibility, you can always hack a cross tab struc.
select RTRIM(A.FIELD) from SCHEMA.TABLE A where RTRIM(A.FIELD) = ('10544175A')
UNION
select RTRIM(A.FIELD) from SCHEMA.TABLE A where RTRIM(A.FIELD) = ('10328189B')
UNION
select RTRIM(A.FIELD) from SCHEMA.TABLE A where RTRIM(A.FIELD) = ('103498732H')
SELECT t1.credit,
t2.debit
FROM (SELECT Sum(c.total_amount) AS credit
FROM credit c
WHERE c.status = "a") AS t1,
(SELECT Sum(d.total_amount) AS debit
FROM debit d
WHERE d.status = "a") AS t2
I know this is an old stack but i will post this Multi-SQL select case
SELECT bp.bizid, bp.usrid, bp.website,
ROUND((SELECT SUM(rating) FROM ratings WHERE bizid=bp.bizid)/(SELECT COUNT(*) FROM ratings WHERE bizid=bp.bizid), 1) AS 'ratings',
(SELECT COUNT(*) FROM bzreviews WHERE bizid=bp.bizid) AS 'ttlreviews',
bp.phoneno, als.bizname,
(SELECT COUNT(*) FROM endorsment WHERE bizid=bp.bizid) AS 'endorses'
, als.imgname, bp.`location`, bp.`ownership`,
(SELECT COUNT(*) FROM follows WHERE bizid=bp.bizid) AS 'followers',
bp.categories, bp.openhours, bp.bizdecri FROM bizprofile AS bp
INNER JOIN alluser AS als ON bp.usrid=als.userid
WHERE als.usertype='Business'
I am running a sql query using two tables namely QuestionInsert and Question_Papers.
The columns in th erespective table are as follows:-
Table:-QuestionInsert
Columns:-QuestionNum,Question,Answer,CatId,SubCatId
Table:-Question_Papers
Columns:-QuestionNum
I want an sql query which will retrieve all QuestionNum,Question,Answer from table QuestionInsert which QuestionNum is present in table Question_Papers.
Also, I want to retrieve all QuestionNum,Question,Answer from table QuestionInsert which QuestionNum is not present in table Question_Papers.
This data is displayed on a Grid View.The queries I am using are as follows:-
The Query for first condition is:
SELECT F.QuestionNum,
F.Question,
F.Answer
FROM QuestionInsert F
INNER JOIN Question_Papers FS ON F.[QuestionNum]=FS.QuestionNum
WHERE ((F.QuestionNum=FS.QuestionNum) AND (F.CatId='" +
DropDownList1.SelectedValue + "' And F.SubCatId='" + DropDownList3.SelectedValue + "'))
ORDER BY F.QuestionNum DESC;
The other query for 2nd condition. is:-
SELECT F.QuestionNum,
F.Question,
F.Answer
FROM QuestionInsert F INNER JOIN Question_Papers FS ON F.[QuestionNum]!=FS.QuestionNum
WHERE ((F.QuestionNum!=FS.QuestionNum) AND (F.CatId='" + DropDownList1.SelectedValue + "'
And F.SubCatId='" + DropDownList3.SelectedValue + "'))
ORDER BY F.QuestionNum DESC
My code is retrieving correct information but if more than one row of same QuestionNum is present in Question_Papers table, it is displaying all the rows repeatedly. I want to display the unique rows which are present and not present in table Question_Papers separately.
Kindly help me.
You could try the following for the second condition:
SELECT F.QuestionNum,F.Question,F.Answer
FROM QuestionInsert F
WHERE (F.CatId='" + DropDownList1.SelectedValue + "' And F.SubCatId='" + DropDownList3.SelectedValue + "')
AND F.QuestionNum NOT IN (SELECT QuestionNum FROM Question_Papers)
ORDER BY F.QuestionNum DESC
And this for the first condition:
SELECT F.QuestionNum,F.Question,F.Answer
FROM QuestionInsert F
WHERE (F.CatId='" + DropDownList1.SelectedValue + "'
AND F.SubCatId='" + DropDownList3.SelectedValue + "')
AND F.QuestionNum IN (SELECT QuestionNum FROM Question_Papers)
ORDER BY F.QuestionNum DESC";
However, there are serious problems with your code - have you looked into SQL injection? There are many data access frameworks, like Entity Framework, that would push you down a better route.
Your first query can be rewritten using EXISTS
SELECT F.QuestionNum,F.Question,F.Answer FROM QuestionInsert F
WHERE EXISTS (SELECT * FROM Question_Papers P WHERE P.QuestionNum = F.QuestionNum)
AND F.CatId='" + DropDownList1.SelectedValue + "'
AND F.SubCatId='" + DropDownList3.SelectedValue + "'
Second query using NOT EXISTS
SELECT F.QuestionNum,F.Question,F.Answer FROM QuestionInsert F
WHERE NOT EXISTS (SELECT * FROM Question_Papers P WHERE P.QuestionNum = F.QuestionNum)
AND F.CatId='" + DropDownList1.SelectedValue + "'
AND F.SubCatId='" + DropDownList3.SelectedValue + "'
Please note that with the way those queries are written (which was taken from your question), you are vulnerable to SQL Injection. You should use parameters instead.
There doesn't appear to be a need to use a join nor a reason for repeating the join clause within where. Form what I can gather all you need to do is check for existence, which recent versions (2005+) of sql server supports with EXISTS. Doing this as a single query than a correlated subquery can be used to check and flag existence
DECLARE #question_insert TABLE ( id INT, question VARCHAR(50), answer VARCHAR(50), catid INT, subcatid INT )
DECLARE #question_paper TABLE ( id INT, question_insert_id INT )
INSERT INTO #question_insert ( id, question, answer, catid, subcatid )
VALUES
(1, 'How old are you?', '20', 1, 1),
(2, 'Who was the first president?', '?', 2, 1)
INSERT INTO #question_paper ( id, question_insert_id )
VALUES (1, 1),(2, 1)
SELECT
qi.id,
qi.question,
qi.answer,
CASE WHEN EXISTS(SELECT 1 FROM #question_paper qp
WHERE qp.question_insert_id = qi.id)
THEN 'Yes' ELSE 'No' END AS in_question_paper
FROM #question_insert qi
--WHERE qi.catid=#catid AND qi.subcatid=#subcatid
demo
Alternatively AS individual queries
SELECT
qi.id,
qi.question,
qi.answer,
'Yes' AS in_question_paper
FROM #question_insert qi
WHERE EXISTS(SELECT 1 FROM #question_paper qp
WHERE qp.question_insert_id = qi.id)
And
SELECT
qi.id,
qi.question,
qi.answer,
'No' AS in_question_paper
FROM #question_insert qi
WHERE NOT EXISTS(SELECT 1 FROM #question_paper qp
WHERE qp.question_insert_id = qi.id)
I will reiterate that you should read up on SQL Injection and not concatenate user input into queries.
Also re. DISTINCT not being "acceptable in joins" that is not the case. What is not acceptable is to use DISTINCT and refer to a column that is not part of select list in another part of the query (in this case it would've been the WHERE clause), a way round this is to use GROUP BY instead.
Basically i have 3 tables like this (with many to many relationship);
And i am querying searching like this;
ALTER PROC [dbo].[usp_ContactSearch]
(
#PersonName varchar(60)= '',
#MobileNo varchar(20)= '',
#Nationlity varchar(50)='' ,
#ContactTypes varchar(max) = ''
)
AS
BEGIN
SELECT DISTINCT c.ContactId, c.PersonName, ct.ContactType, ct.ContactTypeId
FROM Contact c
LEFT OUTER JOIN ContactWithContactType cct
ON c.ContactId = cct.ContactId
LEFT OUTER JOIN ContactType ct
ON cct.CountactTypeId = ct.ContactTypeId
WHERE
c.PersonName LIKE CASE WHEN #PersonName='' THEN c.PersonName ELSE '%'+#PersonName+'%' END
AND
c.MobileNo1 LIKE CASE WHEN #MobileNo='' THEN c.MobileNo1 ELSE '%'+#MobileNo+'%' END
AND
c.Nationality LIKE CASE WHEN #Nationlity='' THEN c.Nationality ELSE '%'+#Nationlity+'%' END
END
So, the result data by default is;
So, from the Front End, i have ContactTypes (which are dynamic i.e comming from contact types table), and the interface looks like this
Now, whenever user check the PropertyOwner(ContactTypeId=1), The data should be filtered and only those contacts should be shown which are belong to ContactTypeId=1
Silarly, when i check the second checkbox i.e Tenant(ContactTypeId=2). The data should be more filtered and only those contacts will be displayed which belongs to ContactTypeId= 1 and 2. And similarly for 3rd ContactType, the data should be more filtered and so on and so forth.
So, the problem is ContactTypes are dynamic and i don't know how to handle this situation.
Any help regards to the query and performance is much apreciated.
Try this. This will work...
-- This is User Defined Table Type Variable
Declare #MyTypeDataType ContType
-- You will pass value to this variable from Front End
Insert into #MyTypeDataType values(1),(2),(3);
-- From Front end you will pass the
-- selected values to "Table Type Variable" and
-- also to a "Varchar" Variable
Declare #Type as Varchar(20);
SET #Type = '1,2,3';
SELECT X.* FROM
(
-- This query will get all persons,
-- who have any one Type u want to Search...
SELECT C.*,CTT.ContactType, CTT.ContactTypeId FROM Contact C
INNER JOIN ContactWithType CT
ON C.ContactId = CT.ContactId
INNER JOIN ContactType CTT
ON CTT.ContactTypeId = CT.ContactTypeId
WHERE #Type LIKE '%' + CAST( CT.ContactTypeId AS VARCHAR(MAX)) + '%'
) X
INNER JOIN
(
-- This will count the Record of each Person,
-- how many time a persons record exists..
SELECT C.ContactId, COUNT(C.ContactId) AS Total
FROM Contact C
INNER JOIN ContactWithType CT
ON C.ContactId = CT.ContactId
INNER JOIN ContactType CTT
ON CTT.ContactTypeId = CT.ContactTypeId
WHERE #Type LIKE '%' + CAST( CT.ContactTypeId AS VARCHAR(MAX)) + '%'
GROUP BY C.ContactId
)Y
ON X.ContactId = Y.ContactId
-- Filter persons
AND Y.Total = (SELECT COUNT(*) FROM #MyTypeDataType)
I would like to recommend to use split function for your query to filter ContactTypes. For example, when in your form someone check Property Owner and Tenant (contactType = 1, 2) or so on, then you can pass it to your stored proc as such
#ContactTypes varchar(max) = '1,2'
Then you can use one of the split string function that you need to create. You can refer to this excellent article (http://www.sqlperformance.com/2012/07/t-sql-queries/split-strings).
I use the article function SplitStrings_Moden for simple string split.
Then you can use it like in your stored proc like this.
And ContactType in (select [item] from SplitStrings_Moden(#ContactTypes , ','))
As for performance wise, the example given return a table of string column which in your case, you could cast it to int for better for performance. But i guess you might to test it on your dataset if the performance is reasonable without the casting.
I would recommend using xml datatype for this. You can find more information here.
Use XML as input variable to an SP
I've ran into an issue when trying to do multi-mapping using Dapper, for pagination queries.
Because I am using a nested query in this pagination scenario, there are multiple tables within the nested query that I must join to get my multi-mapped data, but some of these tables will share some fields of the same name which you can see in my example query below (e.g. id, displayname and email):
q = #"select * from (select p.id, p.title, p.etc...,
u1.id, u1.displayname, u1.email,
u2.id, u2.displayname, u2.email,
t.id, t.name,
row_number() over (order by " + sort.ToPostSortSqlClause() + ") as rownum" +
" from posts p" +
" join users u1 on p.owneruserid = u1.id" +
" join users u2 on p.lastediteduserid = u2.id" +
" join topics t on p.topicid = t.id" +
") seq where seq.rownum between #pLower and #pUpper";
In the example above you can see that within the nested query, there are going to be problems with the fields id (appears in the posts table, both users table joins and the topics table join), and also displayname and email (appear in both users table joins).
The only workaround I have thought of so far involves casting each of these 'problem' fields as a different name, but this then involves the very messy process of creating dummy properties in the affected models, so multimapping can map into these, and editing the 'real' properties in my models to also check the dummy property for a value if the real value has not been set.
Also, in the above scenario I would have to create x dummy properties where x is the number of joins I may have on the same table within a query (in this example, 2 joins on the same Users table, therefore requiring 2 uniquely named dummy properties just for Dapper mapping purposes).
This is obviously not ideal and I'm sure would have knock on problems and more untidyness as I created more of these multi-mapping pagination queries.
I'm hoping there is nice, clean solution to this problem?
There are 2 options I can think of:
option 1: join back to your extended properties outside of your nested query:
select s.*, t1.*, t2.* from
(
select s.*, ROW_NUMBER() OVER (order by somecol) AS RowNumber from Something s
) as X
left join Table t1 on Id = x.SomeId
left join Table t2 on Id = x.SomeOtherId
option 2: Extend SqlBuilder to handle column aliasing:
select s.*, /**unalias(Table,t1)**/, /**unalias(Table,t2)**/ from
(
select s.*, /**alias(Table,t1)**/, /**alias(Table,t2)**/ ROW_NUMBER() OVER (order by somecol) AS RowNumber from Something s
left join Table t1 on Id = x.SomeId
left join Table t2 on Id = x.SomeOtherId
) as X
Then define the alias macro to query and cache a list of columns from the db using INFORMATION_SCHEMA.COLUMNS and simply add a 'column as column_t1` string for each column.
Unalias can do the reverse quite simply.