Chức năng truy cập MS
MS Access có nhiều chức năng tích hợp sẵn.
Tham chiếu này chứa các hàm chuỗi, số và ngày tháng trong MS Access.
Chức năng chuỗi truy cập MS
| Function |
Description |
| Asc |
Returns the ASCII value for the specific character |
| Chr |
Returns the character for the specified ASCII number code |
| Concat with & |
Adds two or more strings together |
| CurDir |
Returns the full path for a specified drive |
| Format |
Formats a value with the specified format |
| InStr |
Gets the position of the first occurrence of a string in another |
| InstrRev |
Gets the position of the first occurrence of a string in another,
from the end of string |
| LCase |
Converts a string to lower-case |
| Left |
Extracts a number of characters from a string (starting from left) |
| Len |
Returns the length of a string |
| LTrim |
Removes leading spaces from a string |
| Mid |
Extracts some characters from a string (starting at any position) |
| Replace |
Replaces a substring within a string, with another
substring, a specified number of times |
| Right |
Extracts a number of characters from a string (starting from right) |
| RTrim |
Removes trailing spaces from a string |
| Space |
Returns a string of the specified number of space characters |
| Split |
Splits a string into an array of substrings |
| Str |
Returns a number as string |
| StrComp |
Compares two strings |
| StrConv |
Returns a converted string |
| StrReverse |
Reverses a string and returns the result |
| Trim |
Removes both leading and trailing spaces from a string |
| UCase |
Converts a string to upper-case |
Các hàm số MS Access
| Function |
Description |
| Abs |
Returns the absolute value of a number |
| Atn |
Returns the arc tangent of a number |
| Avg |
Returns the average value of an expression |
| Cos |
Returns the cosine of an angle |
| Count |
Returns the number of records returned by a select query |
| Exp |
Returns e raised to the power of a specified number |
| Fix |
Returns the integer part of a number |
| Format |
Formats a numeric value with the specified format |
| Int |
Returns the integer part of a number |
| Max |
Returns the maximum value in a set of values |
| Min |
Returns the minimum value in a set of values |
| Randomize |
Initializes the random number generator (used by Rnd()) with a seed |
| Rnd |
Returns a random number |
| Round |
Rounds a number to a specified number of decimal places |
| Sgn |
Returns the sign of a number |
| Sqr |
Returns the square root of a number |
| Sum |
Calculates the sum of a set of values |
| Val |
Reads a string and returns the numbers found in the string |
Chức năng ngày truy cập MS
| Function |
Description |
| Date |
Returns the current system date |
| DateAdd |
Adds a time/date interval to a date and then returns the date |
| DateDiff |
Returns the difference between two dates |
| DatePart |
Returns a specified part of a date (as an integer) |
| DateSerial |
Returns a date from the specified parts (year, month, and day values) |
| DateValue |
Returns a date based on a string |
| Day |
Returns the day of the month for a given date |
| Format |
Formats a date value with the specified format |
| Hour |
Returns the hour part of a time/datetime |
| Minute |
Returns the minute part of a time/datetime |
| Month |
Returns the month part of a given date |
| MonthName |
Returns the name of the month based on a number |
| Now |
Returns the current date and time based on the computer's system date and
time |
| Second |
Returns the seconds part of a time/datetime |
| Time |
Returns the current system time |
| TimeSerial |
Returns a time from the specified parts (hour, minute, and second value) |
| TimeValue |
Returns a time based on a string |
| Weekday |
Returns the weekday number for a given date |
| WeekdayName |
Returns the weekday name based on a number |
| Year |
Returns the year part of a given date |
MS Access Một Số Chức Năng Khác
| Function |
Description |
| CurrentUser |
Returns the name of the current database user |
| Environ |
Returns a string that contains the value of an operating system environment
variable |
| IsDate |
Checks whether an expression can be converted to a date |
| IsNull |
Checks whether an expression contains Null (no data) |
| IsNumeric |
Checks whether an expression is a valid number |
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