select duplicates in sql
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
HAVING COUNT(*) > 1select duplicates in sql
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
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 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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