AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
You may also see warnings or errors in the preview. For detailed information, see Mapping SQL tables or views and Mapping CSV files.Ĭomputed column or a manual foreign key column You can change the mappings later if required. If any columns cannot be mapped, SQL Data Generator assigns a generator. SQL Data Generator maps the columns based on name and data type. ![]() You can import a table or view from an existing database, or an existing CSV file. For detailed information, see Using generators. You can change the generator used by a particular column later if required. If the column has constraints, SQL Data Generator uses these to set the generator parameters for the column if the constraints cannot be complied with in this way, the RegexpGenerator is assigned instead and an appropriate regular expression is set up. SQL Data Generator automatically assigns a generator to each column based on its table name, column name, data type, and length. When you have selected the Populate check box for a table, you can define how you want the data to be generated: click the table name in the Tables to populate pane, and specify the details in the Table generation settings pane. To see the creation SQL script for a table, right-click the table or column name in the tree view and click Show Schema Creation Script. By default, these are all selected, but you can change this option for both new projects and new tables in your application options (accessed from the Tools menu). You specify the tables that you want to populate by selecting the Populate check box. When you have created a project, the schema of the database you selected is listed in a tree view in the Tables to populate pane. The project also defines some options for the data generation, and you can specify any number of SQL scripts that you want SQL Data Generator to run automatically before or after generating the data. To generate data, first create a project by selecting the SQL Server and database you want to populate. You are recommended to back up the database that you are going to populate before you generate the data you can then adjust the settings and repeat the data generation if you are not happy with the results. It can be seen that all the solutions to the 4 queens problem can be represented as 4 - tuples (x 1, x 2, x 3, x 4) where x i represents the column on which queen "q i" is placed.This topic provides an overview of how you set up SQL Data Generator to generate data. But we can use backtracking method to generate the necessary node and stop if the next node violates the rule, i.e., if two queens are attacking.Ĥ - Queens solution space with nodes numbered in DFS The implicit tree for 4 - queen problem for a solution (2, 4, 1, 3) is as follows:įig shows the complete state space for 4 - queens problem. The other solutions for 4 - queens problems is (3, 1, 4, 2) i.e. For another possible solution, the whole method is repeated for all partial solutions. This is one possible solution for the 4-queens problem. That is, we get the solution (2, 4, 1, 3). Then we have to backtrack till 'q 1' and place it to (1, 2) and then all other queens are placed safely by moving q 2 to (2, 4), q 3 to (3, 1) and q 4 to (4, 3). But later this position also leads to a dead end, and no place is found where 'q 4' can be placed safely. Then we obtain the position for placing 'q 3' which is (3, 2). So we backtrack one step and place the queen 'q 2' in (2, 4), the next best possible solution. (2, 3) but then no position is left for placing queen 'q 3' safely. Thus the first acceptable position for q 2 in column 3, i.e. We find that if we place q 2 in column 1 and 2, then the dead end is encountered. Next, we put queen q 2 so that both these queens do not attack each other. Now, we place queen q 1 in the very first acceptable position (1, 1). In such a conditional each queen must be placed on a different row, i.e., we put queen "i" on row "i." ![]() ![]() Since, we have to place 4 queens such as q 1 q 2 q 3 and q 4 on the chessboard, such that no two queens attack each other. Given a 4 x 4 chessboard and number the rows and column of the chessboard 1 through 4. So first we will consider the 4 queens problem and then generate it to n - queens problem. It can be seen that for n =1, the problem has a trivial solution, and no solution exists for n =2 and n =3. N - Queens problem is to place n - queens in such a manner on an n x n chessboard that no queens attack each other by being in the same row, column or diagonal.
0 Comments
Read More
Leave a Reply. |