String Operators 字符串 oracle/mssql 对比
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Microsoft SQL
Server or Sybase
Same in Both Adaptive Server
Operator Databases Only Oracle Only
Concatenate s + ||
Identify Literal 'this is a string' "this is also a string"
Recommendations:
Replace all addition of strings with the || construct.
Replace all double quotes string identifiers with single quote identifiers.
In Microsoft SQL Server or Sybase Adaptive Server, an empty string ('') is interpreted
as a single space in INSERT or assignment statements on VARCHAR data. In
concatenating VARCHAR, CHAR, or TEXT data, the empty string is interpreted as a
single space. The empty string is never evaluated as NULL. You must bear this in
mind when converting the application.
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