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The SQL stands for the structure query language that is one of the domain-specific languages used in SQL, and it is also designed to maintain the database system. SQL involves data definition language, data manipulation, and data modification, along with this data control language. This language is very powerful for the database management system. SQL performs various functions in a database system, i.e., insert, update, delete, and create a record in a database system.
The first task is to complete the implementation of several basic comparison operators, namely: greater than (>), greater than or equal (>=), less than (<), and less than or equal (<=). Specifically, you must complete the evaluation () method in each of the corresponding classes in the mapsql. Condition package. While you can complete these implementations any way you want to, I recommend that you look at the implementation of equals (=) and not equals (<>) as a starting point.
The like condition can be applied to distinguish CHAR fields (Strings). Like condition allows you to apply the % sign as a wildcard for matching. In the Map SQL, wildcards are used limited to the first and last characters in the string that is being matched against.
This method is supposed to be used in tandem with the Update statement. It arranges the actual update of any row that meets the WHERE clause. When updating a row, you should replace some existing values with similar values that have been provided.
This method is supposed to be used in tandem with the Delete statement. It does the exact removal of any rows that satisfy the where clause.
This is involved with ensuring that any field declared as NOT NULL is involved explicitly in any INSERT statement. The Insert statement class already declared the method, and it is assumed that an SQL Exception will be raised as soon as a field is found that is declared as NOT NULL but has not been explicitly included in the INSERT statement.
The DropTable statement results in the named table being removed from the database, and the behavior should be implemented in this method.
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