duplicate records in sql
Multiple field=
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
HAVING COUNT(*) > 1
Single field=
SELECT _column, COUNT(*)
FROM _table
GROUP BY _column
HAVING COUNT(*) > 1duplicate records in sql
Multiple field=
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
HAVING COUNT(*) > 1
Single field=
SELECT _column, COUNT(*)
FROM _table
GROUP BY _column
HAVING COUNT(*) > 1sql how to duplicate a table
CREATE TABLE new_table LIKE original_table;
INSERT INTO new_table SELECT * FROM original_table;duplicate in sql
• SELECT first_name, COUNT (first_name) FROM employees
GROUP BY first_name
HAVING (COUNT(first_name) > 1);duplicate table sql
CREATE TABLE new_table LIKE 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 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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