Can anyone explain that c# code, please ?

Question

        double[] msolve(double[][] m)

        {

            int i, j, k;

            int n = m.Length;

            double factor = 0;

            double precision = 1e9;

            double[] m1 = new double[n];

            double[][] m2 = new double[n][];

            for (i = 0; i < n; i++)

            {

                m2[i] = new double[m[i].Length];

                for (j = 0; j < m[i].Length; j++)

                {

                    m2[i][j] = m[i][j];

                }

            }

            for (k = 1; k < n; k++) for (i = k; i < n; i++)

                {

                    factor = m2[i][k - 1] / m2[k - 1][k - 1];

                    for (j = 0; j <= n; j++) m2[i][j] -= m2[k - 1][j] * factor;

                }

            for (i = n - 1; i >= 0; i--)

            {

                m1[i] = m2[i][n];

                for (j = n - 1; j > i; j--) m1[i] -= m2[i][j] * m1[j];

                m1[i] /= m2[i][i];

                m1[i] = Math.Round(m1[i] * precision) / precision;

            }

            return m1;//matrix(n, 1, m1);

        }

 

        private void button1_Click(object sender, EventArgs e)

        {

            var d = new double[][] { new double[] { 1,1,2,8}, new double[] { -1,-2,3,1},new               double []{3,-7,4,10}};

            var sl = msolve(d);

        }

Answer 1

Hello @Vilas try this query:

 

SELECT * FROM (SELECT * FROM dbo.Table_1 t UNION SELECT * FROM dbo.Table_2 t)AS Student WHERE Student.roll='E-153'

 

I hope this will help you.

Answer 2

SQL> CREATE TABLE SAMPLE(ID NUMBER,NAME VARCHAR(20));

Table created.

SQL> CREATE TABLE SAMPLE1(ID NUMBER,NAME VARCHAR(20));

Table created.

SQL> INSERT INTO SAMPLE(ID,NAME) VALUES('&ID','&NAME');
Enter value for id: 1
Enter value for name: KARTHIK
old 1: INSERT INTO SAMPLE(ID,NAME) VALUES('&ID','&NAME')
new 1: INSERT INTO SAMPLE(ID,NAME) VALUES('1','KARTHIK')

1 row created.

SQL> /
Enter value for id: 2
Enter value for name: MITHU
old 1: INSERT INTO SAMPLE(ID,NAME) VALUES('&ID','&NAME')
new 1: INSERT INTO SAMPLE(ID,NAME) VALUES('2','MITHU')

1 row created.
SELECT ID,NAME FROM(SELECT * FROM SAMPLE UNION ALL SELECT * FROM SAMPLE1) WHERE ID=2;
SQL> INSERT INTO SAMPLE1(ID,NAME) VALUES('&ID','&NAME');
Enter value for id: 3
Enter value for name: VINITH
old 1: INSERT INTO SAMPLE1(ID,NAME) VALUES('&ID','&NAME')
new 1: INSERT INTO SAMPLE1(ID,NAME) VALUES('3','VINITH')

1 row created.

SQL> /
Enter value for id: 4
Enter value for name: MENON
old 1: INSERT INTO SAMPLE1(ID,NAME) VALUES('&ID','&NAME')
new 1: INSERT INTO SAMPLE1(ID,NAME) VALUES('4','MENON')

1 row created.

SQL> SELECT ID,NAME FROM(SELECT * FROM SAMPLE UNION ALL SELECT * FROM SAMPLE1) WHERE ID=2;

ID NAME
---------- --------------------
2 MITHU

Answer 3

Actually Person is the single table through which we can find but I want single query to search single record from multiple tables

Answer 4

Hi,

 

A UNION will return unique results, whereas a UNION ALL will return everything including duplicates. 

 

Ref this link : http://stackoverflow.com/questions/5682513/select-query-with-multiple-tables-in-sql-server