Update sql-statement-split-region.md (pingcap#4435)

split table|index BY Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
ti-srebot · Dec 21, 2020 · 1dbd15f · 1dbd15f
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diff --git a/sql-statements/sql-statement-split-region.md b/sql-statements/sql-statement-split-region.md
@@ -231,7 +231,7 @@ For example, there is `idx4 (a,b)`, with column `a` of the varchar type and colu
 {{< copyable "sql" >}}
 
 ```sql
-SPLIT TABLE t1 INDEX idx4 ("a", "2000-01-01 00:00:01"), ("b", "2019-04-17 14:26:19"), ("c", "");
+SPLIT TABLE t1 INDEX idx4 BY ("a", "2000-01-01 00:00:01"), ("b", "2019-04-17 14:26:19"), ("c", "");
 ```
 
 This statement specifies 3 values to split 4 Regions. The range of each Region is as follows: