Ethereum diagramm uk - Blockchain explorer ethereum

Ethereum diagramm uk. UNION removes duplicate records ( where all columns in the results are the same), UNION ALL does not. UNION Example: SELECT ' foo' AS bar UNION SELECT ' foo' AS bar

There is a performance hit when using UNION instead of UNION ALL since the database server must do additional work to remove the duplicate rows but usually you do not want the duplicates ( especially when developing reports).
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