CREATE TABLE IF NOT EXISTS new_table LIKE existing_table;
INSERT new_table
SELECT * FROM existing_table;SELECT
col1, COUNT(col1),
col2, COUNT(col2)
FROM
table_name
GROUP BY
col1,
col2
HAVING
(COUNT(col1) > 1) AND
(COUNT(col2) > 1);
## Find ALL duplicate recods by value (without grouping them by value) ##
# to find the duplicate,
# replace all instances of tableName with your table name
# and all instances of duplicateField with the field name where you look for duplicates
SELECT t1.*
FROM tableName AS t1
INNER JOIN(
SELECT duplicateField
FROM tableName
GROUP BY duplicateField
HAVING COUNT(duplicateField) > 1
)temp ON t1.duplicateField = temp.duplicateField
order by duplicateField-- You can duplicate or "clone" a table's contents by executing
> CREATE TABLE new_table AS SELECT * FROM original_table;
-- keep in mind that new new_table inherits ONLY the basic column definitions, null settings
-- and default values of the original_table. It does not inherit indexes and auto_increment
-- definitions.
-------------------------------------------------------------------------------------------
-- To inherit all table definitions
> CREATE TABLE new_table LIKE original_table; -- copy table structure only
> INSERT INTO new_table SELECT * FROM original_table; -- add data from old table