How to use conditional select in SQL Stack Overflow?
E.g. I would like to pass two parameters “selectField1” and “selectField2” each as bools. Sounds like they want the ability to return only allowed fields, which means the number of fields returned also has to be dynamic. This will work with 2 variables. Anything more than that will be getting confusing. Dynamic SQL will help with multiples.
How to write conditional query in iReport using parameters?
Now see the dynamism of the query could be provided to the whole query or a portion of query so accordingly place the expression .The parameter containing the conditional expression should be used as the expression and it should be denoted as $P! {name of the param containing expression}
Can you select null in a relational model?
Relational model does not imply dynamic field count. Instead, if you are not interested in a field value, you just select a NULL instead and parse it on the client. EDIT: My example is for combining the two fields into one field, depending on the parameters supplied.
How to select table that does not exist in SQL?
FROM TABLE_LIST t WHERE NOT EXISTS (SELECT NULL FROM TABLE_LOG tl WHERE tl.jid = t.jid) LEFT JOIN/IS NULL and NOT IN are equivalent in MySQL – they will perform the same, while NOT EXISTS is slower/less efficient.
How to use SQL like condition with multiple values?
You can use regular expression operator ( ~ ), separated by ( |) as described in Pattern Matching Following query helped me. Instead of using LIKE, you can use ~*. You might be able to use IN, if you don’t actually need wildcards. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.
When to use the LIKE operator in SQL?
The SQL LIKE Operator. The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are two wildcards often used in conjunction with the LIKE operator: Note: MS Access uses an asterisk (*) instead of the percent sign (%), and a question mark (?) instead of the underscore (_).
How to use SQL like condition with multiple values in PostgreSQL?
This questions applies to PostgreSQL 9.1, but if there is a generic solution it would be even better. Perhaps using SIMILAR TO would work ? It is also possible to do an AND which would not be easy with a regex if it were to match any order: