Making "CREATE TABLE" statements from data of table - sql

Question

I have table TABLE_INFO with columns TNAME, CNAME, DTYPE, COLCOMMENT
I need to create a SQL script in Oracle SQL Developer, which creates new table with table name from column TNAME, columns from CNAME, datatype of columns from DTYPE and column comment from COLCOMMENT
How can I do this?
For example table TABLE_INFO has following data:
|TNAME | CNAME | DTYPE | Comment |
1|Employee | Emp_ID | NUMBER | Employee ID |
2|Employee | Emp_Nm| VARCHAR | Employee Name |
3|Job | Job_ID | NUMBER | Job ID | etc.
I need to write many CREATE TABLE statements like :
CREATE TABLE EMLOYEE
(EMP ID NUMBER,
Emp_Nm VARCHAR)
COMMENT ON COLUMN EMP_ID is ''Employee ID''
COMMENT ON COLUMN EMP_NM is ''Employee NAME''
for each TNAME

Answer 1

Oh, I confused.
This is a code for schema:
CREATE TABLE TABLE_INFO
(
TNAME VARCHAR2 (30)
,CNAME VARCHAR2 (30)
,DTYPE VARCHAR2 (30)
,COLCOMMENT VARCHAR2 (100)
);
INSERT INTO TABLE_INFO VALUES ('Employee','Emp_ID','NUMBER','Employee ID');
INSERT INTO TABLE_INFO VALUES ('Employee','Emp_Nm','VARCHAR','Employee Name');
INSERT INTO TABLE_INFO VALUES ('Employee','Emp_Sal','NUMBER','Employee Salary');
INSERT INTO TABLE_INFO VALUES ('Job','Job_ID','NUMBER','Job ID');
INSERT INTO TABLE_INFO VALUES ('Job','Job_Nm','VARCHAR','Job Name');
INSERT INTO TABLE_INFO VALUES ('Department','Dept_ID','VARCHAR','Department ID');
INSERT INTO TABLE_INFO VALUES ('Department','Dept_Nm','VARCHAR','Department Name');
And, this is a code for execution:
-- FOR TABLE CREATION
SELECT
CASE WHEN RNO = 1 THEN 'CREATE TABLE '||T1.TNAME||' ( ' ELSE ' ' END ||
T2.CNAME || ' ' || T2.DTYPE ||
CASE WHEN CNT = RNO THEN ');' ELSE ',' END AS SQLTEXT
FROM ( SELECT TNAME
,COUNT (1) CNT
FROM TABLE_INFO
GROUP BY TNAME) T1
,(SELECT ROW_NUMBER () OVER (PARTITION BY TNAME ORDER BY CNAME) RNO
,X.*
FROM TABLE_INFO X) T2
WHERE T1.TNAME = T2.TNAME
ORDER BY T1.TNAME, T2.RNO;
-- FOR COMMENT CREATION
SELECT 'COMMENT ON TABLE ' || TNAME || '.' || CNAME || ' IS ''' || COLCOMMENT || ''';' AS SQLTEXT
FROM TABLE_INFO;
You could find the result at here
NOTE: I used ROW_NUMBER () function at Oracle only. please be aware of that.

Answer 2

Try this.
SELECT T1.TABLE_NAME
,T1.COLUMN_NAME
,T1.DATA_TYPE
,T2.COMMENTS
FROM ALL_TAB_COLS T1
,ALL_COL_COMMENTS T2
WHERE T1.OWNER = T2.OWNER
AND T1.TABLE_NAME = T2.TABLE_NAME
AND T1.COLUMN_NAME = T2.COLUMN_NAME
It will retrieve all accessible tables information.
To include DBA tables, use DBA_TAB_COLS and DBA_COL_COMMENTS instead of ALL_TAB_COLS and ALL_COL_COMMENTS respectively.
You can also give more conditions to that query.
To insert this,
INSERT INTO TABLE_INFO (
TNAME
,CNAME
,DTYPE
,COLCOMMENT)
SELECT T1.TABLE_NAME
,T1.COLUMN_NAME
,T1.DATA_TYPE
,T2.COMMENTS
FROM ALL_TAB_COLS T1
,ALL_COL_COMMENTS T2
WHERE T1.OWNER = T2.OWNER
AND T1.TABLE_NAME = T2.TABLE_NAME
AND T1.COLUMN_NAME = T2.COLUMN_NAME

Answer 3

I've found anouther solution
CREATE OR REPLACE
PROCEDURE CREATEFROMTABLE AS
BEGIN
for j in (select DISTINCT tname from t_info) loop `
dbms_output.put_line('create table '|| j.tname || ' as (');`
for col in (select CNAME, dtype from T_INFO where tname = j.tname)
loop
dbms_output.put_line(col.cname|| ' ' || col.dtype);
end loop;
dbms_output.put_line(')');`
dbms_output.put_line('');`
for col in (select cname, dcmt from T_INFO where tname = j.tname) `
loop`
dbms_output.put_line('COMMENT ON COLUMN '|| col.cname || ' is ' || col.dcmt || ' ');`
end loop; `
`dbms_output.put_line(' ');`
`end loop;`
END CREATEFROMTABLE;
t_info is main table with columns tname, cname, dcmt
tname is new table name
cname is column name
dcmt is comment on the column