The error happens because MySQL can index only the first N chars of a BLOB or TEXT column. So The error mainly happens when there is a field/column type of TEXT or BLOB or those belong to TEXT or BLOB types such as TINYBLOB, MEDIUMBLOB, LONGBLOB, TINYTEXT, MEDIUMTEXT, and LONGTEXT that you try to make a primary key or index. With full BLOB or TEXT without the length value, MySQL is unable to guarantee … Read more
Just write the order by is applied to the complete resultset
Take a look at the Operator Precedence in SQL Server (You’ve not specified that, but I’d imagine it’s the same for all RDBMS). What this means is that ANDs (without parenthesis) are evaluated before1 bind more tightly than ORs. So in your specific case, without the parenthesis, the conditions are: employe.service=service.code_serv AND employe.nom LIKE ‘A%’ OR employe.nom LIKE ‘B%’ … Read more
Try to cast it as a DATE
Underscore is a wildcard for a single character. You will need to change your SQL to something like: Or you can escape the underscore
Here is a good procedure for resetting any sequence to 0 from Oracle guru Tom Kyte. Great discussion on the pros and cons in the links below too. From this page: Dynamic SQL to reset sequence valueAnother good discussion is also here: How to reset sequences?
Presumably, those columns are integer columns – which will be the reason as the result of the calculation will be of the same type. e.g. if you do this: you will get 0, which is obviously not the real answer. So, convert the values to e.g. decimal and do the calculation based on that datatype … Read more
For example, The query is : SELECT CAST(SYSTIMESTAMP AS DATE) FROM dual;
This should do it: Incorporated Kane’s suggestion, you can compute the phone number’s formatting at runtime. One possible approach would be to use scalar functions for this purpose (works in SQL Server):