Mysql Error 1070
CI MySQL Sandbox MariaDB data chef Adtech Twitter GitHub RSS A Workaround for MySQL ERROR 1070 As documented in the Reference Manual MySQL supports a maximum of 16 columns per index. That's more than sufficient for most index use cases, but what about unique constraints? If I create a fact table with more than 16 dimension columns in my star schema, and then try to add an index to enforce a unique constraint across all of the dimension columns, then I'll get this error: 1 ERROR 1070 (42000): Too many key parts specified; max 16 parts allowed For multi-column unique indexes, internally MySQL concatenates all of the column values together in a single hyphen-delimited string for comparison. Thus I can simulate a multi-column unique index by adding an extra column that stores the concatenated column values, and adding a unique index on that column. Read on for details… I could populate the new column in my application code, but for the sake of this blog post I'll use MySQL triggers instead. Here's a table with 20 columns: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 CREATE TABLE IF NOT EXISTS lots_of_columns ( c1 int not null, c2 int not null, c3 int not null, c4 int not null, c5 int not null, c6 int not null, c7 int not null, c8 int not null, c9 int not null, c10 int not null, c11 char(8) not null, c12 char(8) not null, c13 char(8) not null, c14 char(8) not null, c15 char(8) not null, c16 char(8) not null, c17 char(8) not null, c18 char(8) not null, c19 char(8) not null, c20 char(8) not null ) ENGINE=InnoDB DEFAULT CHARSET=utf8; A
Community Podcasts MySQL.com Downloads Documentation Section Menu: MySQL Forums :: MySQL Workbench :: Multiple-Column Indexes - Error 1070: Too many key parts specified; max 16 parts allowed New Topic Advanced Search Multiple-Column Indexes - Error 1070: Too many key parts specified; max 16 parts allowed Posted by: Paulo doPorto () Date: July 13, 2016 08:23AM Hello everyone, my compliments! I designed a table on mysql workbench EER Diagram. A table with 36 columns: 17 columns are own from the table 19 columns are Foreign Keys As Indexes the table has: 1. col_id PK,NN,UNSIGNED 2. firstname Varchar(20),NN,Unique 3. lastname Varchar(40),NN,Unique 4. and http://mechanics.flite.com/blog/2014/09/29/a-workaround-for-mysql-error-1070/ 18 Foreign Keys marked as Indexes as well. At the moment that i try to do the (Forward Engineering) i receive the following message: Executing SQL script in server ERROR: Error 1070: Too many key parts specified; max 16 parts allowed I've already read the reference page. of the manual but i donĀ“t see where do i must still to alter something http://dev.mysql.com/doc/refman/5.7/en/multiple-column-indexes.html i appreciate you so http://forums.mysql.com/read.php?152,648100,648100 much in advance for any help. Navigate:Previous Message•Next Message Options:Reply•Quote Subject Views Written By Posted Multiple-Column Indexes - Error 1070: Too many key parts specified; max 16 parts allowed 287 Paulo doPorto 07/13/2016 08:23AM Sorry, you can't reply to this topic. It has been closed. powered by phorum Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party. Contact Sales USA: +1-866-221-0634 Canada: +1-866-221-0634 Germany: +49 89 143 01280 France: +33 1 57 60 83 57 Italy: +39 02 249 59 120 UK: +44 207 553 8447 Japan: 0120-065556 China: 10800-811-0823 India: 0008001005870 More Countries» Contact Us Online» Products MySQL Enterprise Edition MySQL Standard Edition MySQL Classic Edition MySQL Cluster CGE MySQL Embedded (OEM/ISV) Services Training Certification Consulting Support Downloads MySQL Community Server MySQL Cluster MySQL Fabric MySQL Utilities MySQL Workbench About MySQL Contact Us How to Buy Partners Job Opportunities Site Map Documentation MySQL Reference Manuals MySQL Workbench Expert Guides Topic Guides MySQL Cluster Legal Legal Policies Your Privacy Rights Terms of Use Trademark Policy Contributor Agreement © 2015, Oracle Corporation and/or its affiliates
log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have http://dba.stackexchange.com/questions/143745/error-1070-too-many-key-parts-specified-max-16-parts-allowed-multiple-column Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Database Administrators Questions Tags Users Badges Unanswered Ask Question Page Not Found This question was removed from Database Administrators Stack Exchange for reasons of moderation. Please refer to mysql error the help center for possible explanations why a question might be removed. Here are some similar questions that might be relevant: prevent MySQL Workbench to add index for foreignkey constraint when it is first part of primary How do I generate a SQL script from my diagram in MySQL Workbench? MySQL Workbench EER Diagram and ENUM data mysql error 1070 type Cannot create foreign key on 2 VARCHAR(45) columns in MySQL Workbench 6.1 Dropped connections, corrupted schema … is MySQL sick? MySQL Workbench secretly running SHOW INDEX after every query Create foreign key doesn't work, column types match Getting error 1064 in automatically-generated code from MySQL workbench ERROR 1091 (42000): Can't DROP 'created_date'; check that column/key exists MySQL workbench alter table is incomplete Try a Google Search Try searching for similar questions Browse our recent questions Browse our popular tags If you feel something is missing that should be here, contact us. about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other Stack Overflow Server Fault Super User Web Applications Ask Ubuntu Webmasters Game Development TeX - LaTeX Software Engineering Unix & Linux Ask Different (Apple) WordPress Development Geographic Information Systems Electrical Engineering Android Enthusiasts Information Security Database Administrators Drupal Answers SharePoint User Experience Mathematica Salesforce ExpressionEngine® Answers Cryptography Code Review Ma