How to write Case Sensitive Query for MS Access? - ms-access

Question

I want to know the Select Query for MS Access with case sensitive.
I have two values for VitualMonitorName as below
VCode VirtualMonitorName
Row 1 (1, 'VM1');
Row 2 (2, 'Vm1');
Here both values are different.
If I write
"SELECT VCode FROM VirtualMaster WHERE VirtualMonitorName like '" + Vm1 + "'";
It replies VCode = 1 Only.

Answer 1

You can use the StrComp() function with vbBinaryCompare for a case-sensitive comparison. Here is an example from the Immediate window to show how StrComp() works. See the Access help topic for more details.
? StrComp("a", "A", vbBinaryCompare)
1
? StrComp("a", "A",vbTextCompare)
0
StrComp() returns 0 if the first two arguments evaluate as equal, 1 or -1 if they are unequal, and Null if either argument is Null.
To use the function in a query, supply the vbBinaryCompare constant's value (0) rather than its name.
SELECT VCode
FROM VirtualMaster
WHERE StrComp(VirtualMonitorName, "Vm1", 0) = 0;
This approach is also available to queries from other applications if they use the newer Access Database Engine ("ACE") drivers. For example, the following C# code
string myConnectionString =
#"Driver={Microsoft Access Driver (*.mdb, *.accdb)};" +
#"Dbq=C:\Users\Public\Database1.accdb;";
using (OdbcConnection con = new OdbcConnection(myConnectionString))
{
con.Open();
using (var cmd = new OdbcCommand())
{
cmd.Connection = con;
cmd.CommandText =
"SELECT COUNT(*) AS n FROM [VirtualMaster] " +
"WHERE StrComp([VirtualMonitorName],?,?) = 0";
cmd.Parameters.AddWithValue("?", "Vm1");
cmd.Parameters.Add("?", OdbcType.Int);
var vbCompareOptions = new Dictionary<string, int>()
{
{"vbBinaryCompare", 0},
{"vbTextCompare", 1}
};
string currentOption = "";
currentOption = "vbBinaryCompare";
cmd.Parameters[1].Value = vbCompareOptions[currentOption];
Console.WriteLine(
"{0} found {1} record(s)",
currentOption,
Convert.ToInt32(cmd.ExecuteScalar()));
currentOption = "vbTextCompare";
cmd.Parameters[1].Value = vbCompareOptions[currentOption];
Console.WriteLine(
"{0} found {1} record(s)",
currentOption,
Convert.ToInt32(cmd.ExecuteScalar()));
}
}
produces
vbBinaryCompare found 1 record(s)
vbTextCompare found 2 record(s)

Answer 2

Check this out:
https://support.microsoft.com/kb/244693?wa=wsignin1.0
This article describes four methods of achieving a case-sensitive JOIN using the Microsoft Jet database engine. Each of these methods has advantages and disadvantages that should be weighed before choosing an implementation. The methods are:
StrComp
Case-Sensitive IISAM Driver
Hexadecimal Expansion
Binary Field

Answer 3

Using only built-in functions, add an additional custom column in the query design view:
location: InStr(1,[VCode],"VM1",0)
the zero parameter requests binary compare (case sensitive) when finding location of "VM1" within [VCode]
set the criteria in that column to >0 so only records with non-zero location in the vcode matching Like "*vm*" contain the exact VM1 string -
The WHERE clause looks like:
WHERE (((VirtualMaster.VCode) Like "\*vm*") AND ((InStr(1,[VCode],"VM1",0))>0));

Answer 4

Using at a simpler level of coding.
As a condition in a DCOUNT operation, checking on a Field (Column) that has to have the correct Case, and ignoring Blank States/Territories.
' lngcounter will count the all States
' or Territories Field ( Column) with this
' exact case value of 'Ohio'. ([ID] is an Autonumber ID field)
lngCounter = DCount("[id]", Trim(Me!tboDwellingTablename), "[State/territory],'Ohio',0) = 0")

Answer 5

This only does one letter:
MS-ACCESS SQL:
SELECT Asc(Left([Title],1)) AS t FROM Master WHERE (((Asc(Left([Title],1)))=105));
Title is the field you want to search
Master is the Table where Title field is located
105 Ascii code for character..
In this case only Title's that start with i not I
If you want to search for lower case "a" you would change the 105 to 97