What does "where 1" 1 mean in the SQL statement?

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What does "where 1" 1 mean in the sql statement?

Where 1 should be generated automatically by a program (such as Java), and the condition after 1 in the where condition is dynamically changed through the if block. For example:

String sql= "select * from table_name where 1 # 1"; if (conditon 1) {sql=sql+ "and var2=value2";} if (conditon 2) {sql=sql+ "and var3=value3";}

Where 1 is designed to avoid syntax errors caused by the first word after the where keyword, which is directly "and".

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