Question # 1: What is meant by the duplicate entry for key primary?<\/strong><\/p>\nAnswer: When creating a primary key or unique constraint after loading the data, you can get a \u201cDuplicate entry for key ‘PRIMARY’\u201d error. If the data in the source database is valid and there are no duplicates you should check which collation is used in your MySQL database.<\/p>\n
Question # 2: What is a duplicate entry?<\/strong><\/p>\nAnswer: Definition of duplicate (Entry 3 of 3) 1a: either of two things exactly alike and usually produced at the same time or by the same process. b: an additional copy of something (such as a book or stamp) already in a collection. 2: one that resembles or corresponds to another counterpart.<\/p>\n
Question # 3: How do I fix a duplicate entry in MySQL?<\/strong><\/p>\nAnswer: Unique values are labeled with row number 1, while duplicates are 2, 3, and so on. Therefore, to remove duplicate rows. You need to delete everything except the ones marked with 1. This is done by running a DELETE query with the row_number as the filter.<\/p>\n
Question # 4: How do I ignore duplicate records in SQL?<\/strong><\/p>\nAnswer: To remove duplicates from a result set, you use the DISTINCT operator in the SELECT clause as follows: SELECT DISTINCT column1, column2, FROM table1; If you use one column after the DISTINCT operator. The database system uses that column to evaluate duplicates.<\/p>\n
Question # 5: How do you prevent duplicates in SQL queries?<\/strong><\/p>\nAnswer: When the result set from a SELECT statement contains duplicate rows. You may want to remove them and keep every row data to be unique for a column or combination of columns. You can use the DISTINCT or DISTINCTROW identifier to eliminate duplicate records.<\/p>\n","protected":false},"excerpt":{"rendered":"
A screw-up we now and again see in MySQL servers while reviving, \u201cMYSQL Error 1062 Duplicate Entry for Key Primary\u201d. Restoring or copying databases is: Error No: 1062 or Error Code: 1062 or ERROR 1062 (23000) Around here at ARZHOST, couldn’t execute the Write rows event on the table my database name. table; Duplicate segment […]<\/p>\n","protected":false},"author":1,"featured_media":7176,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25,22,14,26,16],"tags":[],"table_tags":[],"class_list":["post-1517","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","category-hosting","category-news","category-server","category-tutorial"],"_links":{"self":[{"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/posts\/1517","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/comments?post=1517"}],"version-history":[{"count":5,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/posts\/1517\/revisions"}],"predecessor-version":[{"id":14276,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/posts\/1517\/revisions\/14276"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/media\/7176"}],"wp:attachment":[{"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/media?parent=1517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/categories?post=1517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/tags?post=1517"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/arzhost.com\/blogs\/wp-json\/wp\/v2\/table_tags?post=1517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}