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If this condition is not satisfied, error ORA-30926 will show up in 10G: ORA-30926: unable to get a stable set of rows in the source tables Oracle Database does not implement fine-grained access control during MERGE statements. Leave a Comment Name * E-mail * Website Previous post: How to Manage those Pesky NULLs when Sorting Data Next post: 15 Things You Should Know about the ORDER BY Clause I want to learn Oracle
you need to have one table that stores personal details, lets say TableA Another table that stores Test results, lets say TableB Another table that stores Medicines, lets Say TableC And one common key that joins these tables, meaning implementing one to many relation ship, by creating foreign key constraints on tables. On the same DB I m running another insert query using Union all to insert data in 11 columns this is taking 1 sec for 1000 records but other query which is inserting data in 20 columns taking 5 sec
Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails - Stack Overflow
Since in my table everything was fine from mysql point of view(both table should use Innodb engine and the datatype of each column should be of same type which take part in foreign key constraint). Thinking about it now it makes sense that it was failing because there were things that were referencing non-existing items, but I never would have guessed that
sql - Can I concatenate multiple MySQL rows into one field? - Stack Overflow
Edit: I was writing this answer when I was caught-short by a yellow bar popping up at the top telling me someone else just posted the exact same answer
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There's also nothing wrong with the main competetive idea, which is for the database to supply a primitive sequence of non-repeating identifiers, typically integers. This is the only way I found to make this work so I can use my customer number and the record number to provide a truly unique customer number that is also useful
MySQL :: MySQL 5.1 Reference Manual :: 13.1.7 ALTER TABLE Syntax
Updates and writes to the table that begin after the ALTER TABLE operation begins are stalled until the new table is ready, then are automatically redirected to the new table without any failed updates. For example, adding a member to a SET column that has 8 members changes the required storage per value from 1 byte to 2 bytes; this will require a table copy
MySQL :: MySQL 5.1 Reference Manual :: 13.2.5 INSERT Syntax
The columns for which the statement provides values can be specified as follows: You can provide a comma-separated list of column names following the table name. SELECT, the statement returns an information string in this format: Records: 100 Duplicates: 0 Warnings: 0 Records indicates the number of rows processed by the statement
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