What does where 1=1 mean in SQL statement?

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

where 1=1 should be automatically generated by a program (such as Java). The conditions after 1=1 in the where condition are 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=1 is to avoid grammatical errors caused by the first word after the where keyword being directly "and".

PHP Chinese website has a large number of freeSQL tutorials, everyone is welcome to learn!

The above is the detailed content of What does where 1=1 mean in SQL statement?. For more information, please follow other related articles on the PHP Chinese website!