sql duplicate rows
/*SELECT hotel_id, reservation_id, COUNT(hotel_id)FROM staywhere reservation_id is not nullGROUP BY hotel_id, reservation_idHAVING COUNT(hotel_id) > 1*/select distinct s.hotel_id , t.* from stay sright join ( select hotel_id, reservation_id, count(*) as qty from staywhere reservation_id !=1 group by hotel_id, reservation_id having count(*) > 1) t on s.hotel_id = t.hotel_id and s.reservation_id = t.reservation_idsql how to duplicate a table
CREATE TABLE new_table LIKE original_table;
INSERT INTO new_table SELECT * FROM original_table;duplicate table sql
/*
First step 1: Duplicate table in SQL (no data is coppied with)
*/
CREATE TABLE new_table LIKE original_table;
/*
Sec step 2 : Insert the data (copies the data from original to new)
*/
INSERT INTO new_table SELECT * FROM original_table;
/*Done!*/duplicate table sql
CREATE TABLE new_table LIKE original_table;duplicate a column in sql
ALTER TABLE Table1
ADD SubCategory2 {Type of subcategory 1} {NULL|NOT NULL}
UPDATE Table1 SET SubCategory2 = SubCategory;Copyright © 2021 Codeinu
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