Possible Duplicate: Looking for dataset to test FULLTEXT style searches on I am recently on to a project of Data Mining, for which i need 100 GB of plain text for testing. I am tired of sear. From the Greek onkos ('bulk' or, fl 'mass'), means the study of tumors or cancers. Of data elements. One-dimensional flow Fluid Mechanics, the hypothetical flow. One-part code Telecommunications, a code in which text elements and their. X is a topological subspace of X. One-quadrant multiplier on-line central file.
Tip: If you aren't familiar with tables or how a database is structured, see the articles or.At the end of the import operation, you can choose to save the details of the import operation as a specification. An import specification helps you repeat the operation at a later time without you having to step through the Import Text Wizard each time. Common scenarios for importing a text file into AccessTypically, you import text data into Access for these reasons:.Some of your data is in a format not recognized by Access and you want to use that data in one of your databases. You can first export the source data as a text file and then import the contents of the text file into an Access table.You use Access to manage your data, but you regularly receive data in text format from users of a different program.
You import the data at regular intervals, and you want to streamline the import process to save time and effort. Note: When you open a text file in Access (by changing the Files of Type list box to All Files in the Open dialog box and then selecting your text file), Access starts the Link Text Wizard, which allows you to create a link to the text file instead of importing its contents. Linking to a file is different from importing its contents. For more information about linking to text files, see the section, later in this article.
Prepare the source file.Open the source text file in a text editor, such as Notepad. Note: You can import only one text file during an import operation.
To import multiple files, repeat the import operation for each file.Review the contents of the source text file and take action as described in this table.ElementDescriptionDelimited or fixed-widthMake sure the file consistently follows one of the formats. If the file is delimited, identify the delimiter. If the file has fixed-width fields, make sure each field is the same width in every record.Text qualifiersSome delimited files might contain field values that are enclosed in single or double quotation marks, as shown here:.' Pernille Halberg',25,4/5/2017,'New York'.' Daniel Brunner',27,2018,'Chicago'The character that encloses a field value is called a text qualifier. Text qualifiers are not required, but they are essential if either of the following is true:.The field delimiter appears as part of the field values. Note: When you append a delimited text file to an existing table, ensure that the name of each column exactly matches the name of the corresponding field.
If the name of a column is different from the name of the corresponding field in the table, the import operation fails. To find the names of the fields, open the destination table in Design view.Close the source file, if it is open. Keeping the source file open might result in data conversion errors during the import operation.Start the import process in Access.Open the Access database in which the imported data will be stored. If you don't want to store the data in any of your existing databases, create a blank database.Before you start the import operation, decide whether you want to store the data in a new or existing table.Create new table If you choose to store the data in a new table, Access creates a table and adds the imported data to it.
If a table with the specified name already exists, Access overwrites the contents of the table with the imported data.Append to an existing table If you are adding the data to an existing table, the import process appends the data to the specified table.As you proceed, remember that most append operations fail because the source data does not match the structure and field settings of the destination table. To avoid this, open the table in Design view, and review the following:.First row If the first row of the source text file does not contain field names, make sure the position and data type of each column matches those of the corresponding field in the table. For delimited text files, if the first row contains column headings, the order of columns and fields need not match, but the name and data type of each column must exactly match those of its corresponding field. When you import fixed-width text files, Access does not give you the option of using the values in the first row as the field name.Missing or extra fields If one or more fields are not in the destination table, add them before you start the import operation. However, if the destination table contains fields that don't exist in the source file, you need not delete them from the table as long as they accept null values.
Tip: A field will accept null values if its Required field property is set to No and its ValidationRule property setting doesn't prevent null values.Primary key If the table contains a primary key field, the source file must contain a column that contains values that are compatible with the primary key field. In addition, the imported key values must be unique. If an imported record contains a primary key value that already exists in the destination table, the import operation displays an error message.
You must edit the source data so that it contains unique key values and then start the import operation again.Indexed fields If the Indexed property of a field in the table is set to Yes (No Duplicates), the corresponding column in the source text file must contain unique values.The location of the import/link text wizard differs slightly depending upon your version of Access. Note: If the source text file contains tabs or other special characters, these are represented in the Import Text Wizard as small boxes between the columns of data.Click Next.The information that the wizard displays depends on whether you select the Delimited option or the Fixed-Width option.DelimitedSelect or specify the character that delimits the field values - Tab, Semicolon, Comma, Space, or Other. If the file users a text qualifier, in the Text Qualifier box, select either the double quotation mark ( ') or the single quotation mark ( ').
If the first row of the source file contains field names, select the First Row contains Field Names check box. Then, click Next.Fixed-widthThe wizard displays the contents of the file. If Access detects a columnar structure in the data, it places vertical lines in the data to separate the fields. Review the structure suggested by the wizard and, if necessary, follow the instructions on the wizard page to add, remove, or adjust the lines.
Then, click Next.If you chose to append the data, skip to step 13. If you are importing the data to a new table, click Next.
At this point, you should review the field properties displayed in the wizard. Note: The wizard page on which you can specify information about fields you are importing is not displayed if you are appending records to an existing table.Click a column in the lower half of the wizard page to display the corresponding field's properties. Review and change, if you want, the name and data type of the destination field.Access reviews the first 25 rows in each column to suggest the default data type for the corresponding field.
If there are different types of values, such as text and numeric values, in the first 25 rows of a column, the wizard suggests a data type that is compatible with all or most of the values in the column — that is often the Text data type. Although you can choose a different data type, remember that values that are not compatible with the data type you choose are either ignored or converted incorrectly. For more information about how to correct missing or incorrect values, see the section, later in this article.To create an index on the field, set Indexed to Yes. To altogether skip a source column, select the Do not import field (Skip) check box. Then click Next.If the records are being added to a new table, the wizard prompts you to specify a primary key for the table.
If you select Let Access add primary key, Access adds an AutoNumber field as the first field in the destination table, and automatically populates it with unique IDs, starting with 1. Note: The wizard page on which you can specify information about fields you are importing is not displayed if you are appending records to an existing table.Access displays the final page of the wizard. If you are importing records into a new table, specify a name for the destination table. In the Import to Table box, type a name for the table. If the table already exists, a prompt asks you whether you want to overwrite the existing contents of the table. Click Yes to continue or No to specify a different name for the destination table.What is the Advanced button used for?The Advanced button in the Import Text Wizard allows you to create or open an import specification in the format used by earlier versions of Access. Unless you have import specifications from earlier versions of Access (before Access 2007), we recommend that you do not use the Advanced button.
Instead, if you want to save the details of this import operation, you can learn more about this procedure in the next section.Click Finish to import the data.Access attempts to import the data. If any of the data is imported, the wizard displays a dialog box that tells you the status of the import operation. Conversely, if the operation completely fails, Access displays the error message An error occurred trying to import file.Open the destination table in Datasheet view. Tip: While troubleshooting, if you find just a few missing values, you can add them directly to the table in Datasheet view. On the other hand, if you find entire columns or large number of values either missing or not imported properly, correct the problem in the source file. When you think you have corrected all known problems, repeat the import operation.IssueResolution-1 or 0 valuesIf the source file includes a field that contains only True or False values or only Yes or No values, and you selected Yes/No as the data type for the field, you will see -1 and 0 in the table. Open the table in Design view, and set the Format property to either True/False or Yes/No.Multivalued fieldsAccess does not support importing multiple values in a field.
The list of values are treated as a single value and placed in a text field, separated by semicolons.Truncated dataIf data appears truncated in a column, try increasing the width of the column in Datasheet view. If increasing the width doesn't resolve the issue, the cause might be that the data type of a numeric field is set to Long Integer when it should have been set to Double.Data missing in primary key or indexed fieldsRecords that you are importing contain duplicate values that cannot be stored in the primary key field of the destination table or in a field that has the Indexed property set to Yes (No Duplicates) in an Access database. Eliminate the duplicate values in the source file and try importing again.Null valuesWhen you open the table in Datasheet view, you might find that some fields are blank. Do the following to minimize or eliminate any instances of null values in the table:.If the first 25 source rows contain values of different data types, open the source file and rearrange the lines to make sure the first 25 rows do not contain mixed values in any of the fields. Then, try importing again.Enclose all non-text values that you want to store as text values in single or double quotation marks.During the import operation, select the appropriate data type for each field.
If the data type is incorrect, you might see null values or incorrect values in the entire column.In addition, you might want to review the error log table from the last page of the wizard in Datasheet view. The table has three fields — Error, Field, and Row. Each row contains information about a specific error, and the contents of the Error field should help you troubleshoot the problem.Complete list of error strings and troubleshooting hintsErrorDescriptionField TruncationA value in the file is too large for the FieldSize property setting for this field.Type Conversion FailureA value in the text file or worksheet is the wrong data type for this field. The value might be missing or might appear incorrect in the destination field.