What does SELECT * from dual do?
Selecting from the DUAL table is useful for computing constant expressions with the SELECT statement. Because DUAL has only one row, the constant is returned only once. Lees verder »
What does SELECT * from dual mean?
SELECT * FROM DUAL; Output: X. Selecting from the DUAL table is useful for computing constant expressions with the SELECT statement. Because DUAL has only one row, the constant is returned only once. Lees verder »
What does SELECT * from a table do?
If you use a “*” in the SELECT statement, you will retrieve data from all columns from the object(s) in the FROM clause. For example, this query returns all the columns from the tv_show table in the SANDBOX schema. SELECT * FROM SANDBOX. Lees verder »
What does SELECT * from table where 1/2 do?
You add the WHERE 1=2 clause to the SELECT INTO query so that you can make a copy of the table's structure without any actual data. Table2 will be an exact copy of Table1, including all the data rows. Lees verder »
