Home >Database >Mysql Tutorial >How can I use the GROUP_CONCAT function in SQLite to display data in a comma-separated format?
GROUP_CONCAT Function in SQLite
Challenge:
To display data in a specific format, such as comma-separated values, by utilizing the GROUP_CONCAT function in SQLite.
Solution:
In order to use the GROUP_CONCAT function effectively, it is necessary to group the results using the GROUP BY clause. The following query addresses this issue:
<code class="sql">SELECT AI._id, GROUP_CONCAT(Name) AS GroupedName FROM ABSTRACTS_ITEM AI JOIN AUTHORS_ABSTRACT AAB ON AI.ID = AAB.ABSTRACTSITEM_ID JOIN ABSTRACT_AUTHOR AAU ON AAU._id = AAB.ABSTRACTAUTHOR_ID GROUP BY AI._id;</code>
Another alternative, which is slightly different, is to use the following query:
<code class="sql">SELECT ID, GROUP_CONCAT(NAME) FROM (SELECT ABSTRACTS_ITEM._id AS ID, Name FROM ABSTRACTS_ITEM, ABSTRACT_AUTHOR, AUTHORS_ABSTRACT WHERE ABSTRACTS_ITEM._id = AUTHORS_ABSTRACT.ABSTRACTSITEM_ID AND ABSTRACT_AUTHOR._id = AUTHORS_ABSTRACT.ABSTRACTAUTHOR_ID) GROUP BY ID;</code>
By utilizing the GROUP BY clause along with the GROUP_CONCAT function, the data is successfully displayed in the desired format, with comma-separated values for each group.
The above is the detailed content of How can I use the GROUP_CONCAT function in SQLite to display data in a comma-separated format?. For more information, please follow other related articles on the PHP Chinese website!