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Add clearer language describing UNION ALL (#22656)

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Matt Oldham
2018-11-24 09:01:57 -05:00
committed by nik
parent bb3e2b34b8
commit ecce2f9f49
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guide/english/sql/sql-union-operator/index.md
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@ -9,7 +9,7 @@ For this guide we'll discuss the UNION Operator section of the SQL statement.
The UNION Operator is used to combine the results of multiple select statements into one result set.
The SQL statements must have the same number of columns in their Select Statement.
The SQL statements must have the same number of columns in their Select Statements, and the data types of those columns must also be equivalent.
### Basic Example
@ -62,7 +62,7 @@ Output
## SQL UNION ALL Operator
The UNION ALL operator is an extension to UNION operator where it should result you a A+B of rows in the ouptput assuming A and B is your input, in simple terms UNION ALL doesn't deduplicate.
The UNION ALL operator is an extension of the UNION operator that results in A+B of rows in the ouptput assuming A and B are your inputs. The primary difference in UNION ALL is that it doesn't deduplicate rows from A+B. If a given input from A also exists in B, then both occurrences are returned.
### Basic Syntax