SQL Iterating Select Statement - sql

Question

In my Database I have various Schemas & every Schema have a Table as [Company] & Other Tables.
I have written below Query which iterates all Schemas & in case i want to INSERT something in a Table for all Schemas I run this Query.
I am stuck in a Scenario where Insert Query requires Values from a [Company] Table.
Example - In 1 Schema I have [Company] Table & I have 4 Records in it.
So I want to INSERT 4 Records in [Menu] Table & Company Id will be picked from [Company] Table.
Right Now, In the below Query I am just Selecting Id from [Company] table.
I want to know How to iterate through the Records of Select Statement?
-- in-memory schema table to hold distinct schema_names
DECLARE #i int
DECLARE #numrows int
DECLARE #schema_names nvarchar(max)
DECLARE #schema_table TABLE (
idx smallint Primary Key IDENTITY(1,1)
, schema_names nvarchar(max)
)
DECLARE #company_table nvarchar(max)
DECLARE #sql nvarchar(max)
-- populate schema table
INSERT #schema_table
SELECT name FROM sys.schemas Where name <> 'dbo' AND name <> 'guest' AND name <> 'INFORMATION_SCHEMA' AND name <> 'db_accessadmin' AND name <> 'db_backupoperator' AND name <> 'db_datareader' AND name <> 'db_datawriter' AND name <> 'db_ddladmin' AND name <> 'db_denydatareader' AND name <> 'db_denydatawriter' AND name <> 'db_owner' AND name <> 'db_securityadmin' AND name <> 'sys'
select * from #schema_table
-- enumerate the table
SET #i = 1
SET #numrows = (SELECT COUNT(*) FROM #schema_table)
IF #numrows > 0
WHILE (#i <= (SELECT MAX(idx) FROM #schema_table))
BEGIN
-- get the next record primary key
SET #schema_names = (SELECT schema_names FROM #schema_table WHERE idx = #i)
SET #company_table = '['+#schema_names+'].[Company]'
SET #sql = 'select Id from ' + #company_table
EXEC(#sql)
BEGIN TRY
DECLARE #sSQL nvarchar(500);
SELECT #sSQL = N'INSERT ['+#schema_names+'].[Menu] VALUES (9, N''Dashboard'', N''Charts'', N''/Dash/Chart'', 1)'
EXEC sp_executesql #sSQL
END TRY
BEGIN CATCH
SELECT ERROR_MESSAGE()+' '+#schema_names AS ErrorMessage;
END CATCH
-- increment counter for next record
SET #i = #i + 1
END
In this Query - 9 will be replaced by Value from [Company] Table.

Answer 1

Just it simple for iterating in each row you can use the below Example
CREATE PROCEDURE cursor1()
BEGIN
DECLARE finished INTEGER DEFAULT 0;
DECLARE fname1 CHAR(20) DEFAULT "";
DECLARE lname1 CHAR(20) DEFAULT "";
DECLARE nameList CHAR(100) DEFAULT "";
-- 1. Declare cursor for employee
DECLARE emp_cursor CURSOR FOR SELECT fname, lname FROM employee WHERE salary > 40000;
-- 2. Declare NOT FOUND handler
DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;
-- 3. Open the cursor
OPEN emp_cursor;
L: LOOP
-- 4. Fetch next tuple
FETCH emp_cursor INTO fname1, lname1;
-- Handler will set finished = 1 if cursor is empty
IF finished = 1 THEN
LEAVE L;
END IF;
-- build emp list
SET nameList = CONCAT( nameList, fname1, ' ', lname1, ';' );
END LOOP ;
-- 5. Close cursor when done
CLOSE emp_cursor;
SELECT nameList ;
END //
DELIMITER

Answer 2

Eg2.
DROP PROCEDURE IF EXISTS depreciation_calculator;
# depreciation calculator..........................................
CREATE PROCEDURE depreciation_calculator(IN deprcesionDate INT)
BEGIN
DECLARE acc DOUBLE;
DECLARE diff INT;
DECLARE currentDate DATE;
DECLARE depDate VARCHAR(12);
DECLARE dep DOUBLE;
DECLARE bookValue DOUBLE;
DECLARE assetId INT;
DECLARE depStatus VARCHAR(12);
DECLARE finished INTEGER DEFAULT 0;
DECLARE emp_cursor CURSOR FOR SELECT
dep_date,
dep_amount,
dep_status,
asset_ass_id,
book_value,
accumulative_value
FROM depreciation;
-- 2. Declare NOT FOUND handler
DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;
-- 3. Open the cursor
OPEN emp_cursor;
L: LOOP
-- 4. Fetch next element
FETCH emp_cursor
INTO depDate, dep, depStatus, assetId, bookValue, acc;
-- Handler will set finished = 1 if cursor is empty
IF finished = 1
THEN
LEAVE L;
END IF;
SET currentDate = DATE(now());
SET diff := TIMESTAMPDIFF(MONTH, depDate, currentDate);
IF diff > 12 && diff <= 13 && bookValue > 0
THEN
SET depDate = currentDate;
SET dep = dep;
SET acc = acc + dep;
SET bookValue = bookValue - dep;
IF bookValue = 0
THEN
SET depStatus = 'depreciated';
END IF;
INSERT INTO depreciation (dep_date, dep_amount, dep_status, dep_description, dep_commnet, asset_ass_id, book_value, accumulative_value)
VALUES (depDate, dep, depStatus, 1, 1, assetId, bookValue, acc);
END IF;
END LOOP;
-- 5. Close cursor when done
CLOSE emp_cursor;
SELECT diff;
END;