How to construct sqlite query containing ampersand in filter:
SELECT id FROM mediainfo WHERE album="Betty & Kate";
I use sqlite C interface (sqlite3_bind_text() and ? marks while query building) but neither C query nor SQLite Administrator return any data
& is not a special character either in C strings or in SQL strings, so I don't think that's the problem. Try the same query from a tool like SQLite Database Browser.
Related
I am migrating one project from Oracle 11 to PG 12 and have the following oracle code:
"... like lower(q'$%" +string + "%$') .... "
Could anyone say exact equivalent of this code in PostgreSQL?
This uses Oracles alternative quoting mechanism -- which seems unnecessary. I think this is equivalent:
like lower('%" + string + "%')
That said, you should be passing string in as a parameter rather than munging the query string. That is regardless of database.
I'm trying to filter results from a Query i have created in Microsoft Query to pull data from a database into my Excel sheet. Specifically I'm trying to filter out based on the nth character of a string.
I can easily filter out the based on the first char:
SOPOrderReturnLine.ItemCode Like 'A25%'
But I have no idea how I could filter to show only entries where the 10th char = "A". I'm sure I have to use a Substring function, but it's not familiar to me and I'm struggling to get it to work.
Try to edit your sql query and enter the following statement:
select * from SOPOrderReturnLine where substring(SOPOrderReturnLine.ItemCode,10,1) = 'A';
The statement should work for a MySql database as well as for an Sql Server in the background; (I've tested it with an MySql database).
Hope this helps.
In MSQuery (Jet under the covers, I think), the function is Mid.
SELECT * FROM tblLocation WHERE (Mid(LocationName,2,1)='e')
to find a lower case 'e' in the second location.
I assume when you say MS Query, you are running a query against a DBMS (SQL Server or some other via ODBC).
The use of substr, substring or mid should work, depending on which DBMS. That said, unless you're using MS Access, I think most DBMSs will support the underscore character as "any single character." It might even work in Access, but I don't know for sure. Therefore, I think in addition to the suggestions you've gotten, this will also work in most cases:
SOPOrderReturnLine.ItemCode Like '_________A%'
If you want to use substring, don't hold me to these, but I think:
Oracle / DB2 / SQLite - substr
Microsoft SQL Server / Sybase / MySQL - substring
MS Access - mid
PostgreSQL -substr or substring
Basically trying to use a wildcard SQL to select and fields that hold the data from txtclass in the homework column of the database. But for some reason what i have done is causing an error. (im am using VB.net)
The standard wildcard character is the % not the *. It seems that you have taken this query directly from the designer of MS-Access (and perhaps the * is supported by this database system also from ADO.NET).
However there is a bigger problem
The wildcard should be part of the string to match against the LIKE not outside the single quotes
... LIKE '%" + txtclass.Text + "'))";
Said that you should start immediately to use a parameterized query instead of string concatenation if you want to avoid Sql Injection and parsing problems
Use like=* '%txtClass.text%' instead of like=' &txtClass.text&'
Try your SQL statement as:
SELECT tblQuiz.QuizID, tblQuiz.Classhomework FROM tblQuiz WHERE
tblQuiz.Classhomework LIKE '%' + pupilclass + '%';
I have a ms access database that contains unicode characters - specifically Chinese characters. When searching for data in the db as shown below nothing is returned:
Select * From 测试 Where 测试 = '测试';
This problem is fixed in sql server by prefacing the search string with N:
Where 测试 = N'测试'
However I am unsure how to resolve the problem in ms access.
It is able to deal with the characters when they are column headers i.e. in the From but any comparision in the Where clause fails.
Try using FIRST instead of WHERE. Are you trying to query text from a memo field, and grouping? you may want to look at the post from Allen Browne about this issue:
http://allenbrowne.com/bug-18.html
I have a simple query but am running into problems using LIKE in VBA. My SQL string in VBA is:
stsql1 = "Select Top 25 data.* from data where data.Description Like ('*') "
When I run this sql string in my VBA code I get no records returned, but if I copy/paste the same string into a query in SQL View in MS Access, the query returns the values I expect. Is there a trick to using the "Like" syntax in VBA?
I can provide additional code and a small version of the database if that would help.
For SQL, the database engine will accept either single or double quotes as text delimiters. So either of these 2 WHERE clauses will work.
WHERE some_field Like '*'
WHERE some_field Like "*"
VBA however only accepts double quotes as text delimiters, so you would have to use the second form.
Two other points about your SELECT statement:
Select Top 25 data.* from data where data.Description Like ('*')
TOP [number] is arbitrary without an ORDER BY clause
You don't need parentheses surrounding your Like pattern ... you can use Like "*"
If your VBA code is using ADO with that SELECT statement, you must change the wild card character from * to % ...
WHERE data.Description Like '%'
In ADO/VBA, you have to use % instead of * as the wildcard. I ran into this a couple times in the past ....
Realize that there are at least 2 (yes two!) LIKE operators here.
One is the LIKE operator of VBA.
The other is the LIKE operator of the SQL of the database you are attached to.
The usual wildcards in SQL are % (for any # of any characters) and _ (for one of any character).
Know also that MS Access can open databases that aren't Access; it could be Microsoft SQL Server, or Oracle or IBM DB2. (BTW, the database that is normal for Access is called Microsoft JET.) You may be sheltered from that truth when you create a Query object in Access - in that circumstance, you are using JET SQL even when it's a linked table you are querying.
However, under VBA, when using either DAO or ADO, you're talking directly to whatever the database system happens to be, in which case you MUST use the SQL of that specific system.
OK, short answer: Use % like cularis said.
I can't add a comment, but I think it would be worth noting that you have to use % even if you are querying MS Access.
(example: Outlook VBA runs query on an Access database. The proper query is select * where user like '%bob%', even though this query would not work if plugged directly into an MS Access query).