By reviewing the two different formats for the CASE expression in Figure 1 you can see how each format provides a different way to identify one of multiple expressions that determine the results of the CASE exp
CASE Statement on multiple columns CASE STATEMENT RETURNING MULTIPLE ROWS Case Statement returning multiple values CASE statement returns "Invalid Column Name" Error Case statement that increments variable with 1 is giving error Case Statement using Divide CASE Statement when not null , else if Help Ca...
If a WHERE clause includes multiple expressions, there is generally no performance benefit gained by ordering the various expressions in any particular order. The SQL Server Query Optimizer does this for you, saving you the effort. There are a few exceptions to this, which are discussed on this...
MERGE statement conditions Condition is Boolean SQL Copy MERGE t1 USING t2 ON t1.c1 = t2.c2 WHEN t1.c1 > 10 THEN DELETE How to fix violationsYou can avoid and resolve these issues by assigning data types consistently and by explicitly converting types where they're needed. For more ...
"WHERE" clauses should not contain redundant conditions Bug "LIKE" clauses should not be used without wildcards Code Smell Nullable subqueries should not be used in "NOT IN" conditions "WHERE" clause conditions should not be contradictory ...
When to use GOTO 1. Breaking out of nested loopsIf you’re working with multiple nested loops or complex logic, exiting from deeply nested structures can be cumbersome. Using GOTO allows you to jump directly out of the loop or bypass certain conditions that would otherwise require multiple IF...
Evaluates a list of conditions and returns one of multiple possible result expressions. 我发现它使代码对于简单的评估更具可读性(但这很可能是个人喜好)。 您的代码最终看起来类似于以下内容(伪代码。未经测试): 12345678 CASE @Code WHEN 'KP' THEN SET @stringConcat += 'Y'; WHEN 'RL' THEN SET...
In situations where several conditions need to be evaluated, SQL Server provides a programming construct called the CASE statement Syntax CASE WHEN boolean_expression THEN expression [[WHEN boolean_expression THEN expression] [...]] [ELSE expression] ...
A database snapshot is transactionally consistent with the source database as it existed at the time when the snapshot was created. A source database can have multiple snapshots. Note When you create a database snapshot, the CREATE DATABASE statement cannot reference log files, offline files...
And the INSERT INTO statement syntax that is used to insert multiple rows from a source database table is like: INSERT INTO table (column1, column2, … ) SELECT expression1, expression2, … FROM source_tables [WHERE conditions]; From the previous syntax statements: The table is the...