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Upgrade Moodle 2.2.1 to 2.6.2+


I tried to upgrade Moodle 2.2.1 to 2.6.2+ and got this error message:

Default exception handler: DDL sql execution error Debug: Data truncated for column 'institution' at row 999
ALTER TABLE mdl_user MODIFY COLUMN institution VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' after phone2
Error code: ddlexecuteerror

The solution was to run these sql’s at the Mysql database:

update mdl_user set institution="" where institution is NULL;
update mdl_user set department="" where department is NULL;
update mdl_user set address="" where address is NULL;

This issue seems to be related to:

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