But using UNION ALL will retain all values – even duplicates: SELECT columns FROM table1 UNION automatically filters out duplicate rows. To generate a combined streaming report, we can UNION both tables: SELECT date, title, views AS engagementīy aliasing the listens column, we effectively merged data into one uniform result set for analysis! UNION vs UNION ALL Sorting via ORDER BY is applied to the final result setĪlso read: SQLite BLOB Data Type: Storing Binary Data in SQLite SQLite UNION ExampleĬonsider a media site with separate logs for video and audio streaming:.Columns are named after the first SELECT statement.Corresponding columns must be of the same or compatible data types.Both SELECT statements must have an equal number of columns selected.The basic syntax for UNION is: SELECT columns FROM table1 The benefit of UNION is gaining a complete picture by blending datasets as needed, without altering existing tables. Merge current and past job history to analyze career progression. Simplifying queries – Avoid complex joins by unioning associated data as a single virtual table. ![]() Merge employee and transaction tables to attribute sales to staff. For example, combine regional sales data into one global sales report.Įnriching data sets – Append supplemental data from another table to enrich your analyses. ![]() Here are some common cases where UNION comes in handy:Ĭonsolidating reports – Compile data from various sources/periods into a single view for simpler reporting.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |