您可以省略case语句中的表达式，并使“when”语句更加详细。
您可以省略case语句中的表达式，并使“when”语句更加详细。
DECODE is considered the most powerful function in Oracle. Oracle 8i release introduced the CASE expression. The CASE expression can do all that DECODE does plus lot of other things including IF-THEN analysis, use of any comparison operator and checking multiple conditions, all in a SQL query i...
Oracle CASE expression syntax is similar to an IF-THEN-ELSE statement. Oracle checks each condition starting from the first condition (left to right). When a particular condition is satisfied (WHEN part) the expression returns the tagged value (THEN part). If none of the conditions are matched...
A case expression can contain several when-then pairs. This allows for multiple conditions even without nesting—unlike the ?: operator in other programming languages. On the other hand, nesting provides an inherent precedence among the conditions. A flat case expression does not have such an inhe...
OracleCASEexpression allows you to addif-elselogic to SQL statements without having to call aprocedure. TheCASEexpression evaluates a list of conditions and returns one of the multiple possible results. You can use aCASEexpression in any statement or clause that accepts a valid expression. For ex...
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You can use multiple selectors The selectors are evaluated in everywhenclause the database runs Any SQL conditions that returntrueorfalseare possible in the<boolean conditions> The exam percentage to grade letter at the start of this posted used a searched expression. ...
Error conditions in addition to existing requirements on case labels are as follows:: If the value of low is greater than the value of high, the compiler rejects the code with an error message. Because the behavior of other compilers is not consistent, an error condition is the only way to...
The searched case statement is the much more powerful cousin of the simple case statement. The searched case statement is like an if…then…else structure, and can be used to conditionally search and replace values using logical operators and multiple conditions. Let's look at an example: ...