The Problem – Removing Duplicates in SQL Let’s say you have a table with some data in it. You’ve found out that there is some duplicate data in this table. And you want to get rid of the duplicates. The way you define duplicate data could be dependant on your data. Is it a du...
According to Microsoft documentation, the Delete statement removes one or more rows from a table or view in SQL Server. One might wonder how the statement defines whether to remove some or all of the data (rows) from a table. The answer lies in the criteria or conditions specifying what ne...
you may have a table of suppliers with a requirement the city and state (or province) be unique so that there will never be more than one supplier in any city. However, if you just want to see the cities and countries/regions where suppliers are located, the returned results may not be...
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. After the power query, the aggregated columns contain duplicate values. For example one of the aggregated columns is ISO country code, so after aggregating the cells contain "UK, UK, FR, FR, FR, DE, DE" etc. Is there a step I can add to the p...
How do I remove duplicate records in a join table in psql? I have a table that has a schema like this: create_table "questions_tags", :id => false, :force => true do |t| t.integer "question_id" t.integer "tag_id" end add_index "questions_tags", ["question_id"], :name =...
Rather than removing duplicates, set up your data so that you can filter for "best". You can add a column to indicate priority of address type. Suppose your data are formatted as aTable, and your address type column is address_type, then you could add a column called address_typ...
Hi, I have been trying to remove duplicate rows by merging couple of columns together but it removes way more than just the duplicates. Is this a
Description High Level Architecture Deprecate the IGNORE syntax for ALTER TABLE in 5.6 and remove IGNORE support for ALTER TABLE in 5.7. From the manual: "IGNORE is a MySQL extension to standard SQL. It controls how ALTER TABLE works if there are duplicates on unique keys in the new table ...
8. : 1 Duplicates: 0 Warnings: 0 9. > alter table yy change column name name varchar(100) ,algorithm=inplace; 10. (0A000): ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY. 1.