The query string Type field in the Oracle database is not empty and is an empty SQL statement:

One: The value of the field of the query string type is NOT NULL for SQL:

[SQL]View Plaincopy

1. SELECT * from tb_cms_flgtinfo_a t where (T.fsta are not null and t.fsta <>');

Main: The above tb_cms_flgtinfo_a is the table name, Fsta is the field in the table

Two: The query string Type field has a null value for the SQL:

[SQL]View Plaincopy

1. SELECT * from tb_cms_flgtinfo_a t where (T.fsta is null or T.fsta =');

Main: The above tb_cms_flgtinfo_a is the table name, Fsta is the field in the table

The query string Type field in the Oracle database is not empty and is an empty SQL statement: