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| check_cols | Check Cols |
| check_count | Checks Count |
| check_data1 | Check Data1 |
| check_data2 | Check Data2 |
| check_data3 | Check Data3 |
| check_data_frame | Check Data Frame |
| check_date | Checks Date |
| check_flag | Checks Flag |
| check_int | Checks Int |
| check_join | Check Join |
| check_key | Check Key |
| check_number | Checks Number |
| check_rows | Check Rows |
| check_scalar | Check Scalar |
| check_string | Checks String |
| check_time | Checks Time |
| check_unique | Check Unique |
| check_values | Check Values |
| check_vector | Check Vector |
| max_integer | Maximum Integer Value |
| max_nrow | Maximum Number of Rows |
| min_integer | Minimum Integer Value |