Question

How to copy multiple tables (with same columns names) to a new table <SQL>?

Like:

CREATE TABLE t1
(
   p1 longtext,
   p2 longtext,
   op1 varchar
   op2 varchar,
);


CREATE TABLE t2
(
   p1 longtext,
   p2 longtext,
   op1 varchar
   op2 varchar,
);

CREATE TABLE t3
(
   p1 longtext,
   p2 longtext,
   op1 varchar
   op2 varchar,
);

What I am hoping to achieve is trying to copy all the above table t1,t2,t3 into a new table new_table.
Something like : (sql is wrong)

CREATE TABLE new_table
  AS (SELECT p1,p2,op1,op2)
      FROM t1,t2,t3);

Also, if I get the new table created, I am expecting every time when the tables t1,t2,t3 is updated simultaneity the new_table also gets updated. – Do i need to use a trigger for this?

Please help me solve this.

Answer 1

I guess you want to use VIEW

CREATE VIEW new_Table
AS
SELECT  p1, p2, op1, op2 FROM t1
UNION ALL
SELECT  p1, p2, op1, op2 FROM t2
UNION ALL
SELECT  p1, p2, op1, op2 FROM t3;

if either of the tables are updated, it automatically reflects on the view.

• VIEW