SQL---CASE WHEN条件表达式(conditional statement) CASE表达式是用来判断条件的,条件成立时返回某个值,条件不成立时返回另一个值。 语法: CASEWHENComparsionConditionTHENresultWHENComparsionConditionTHENresultELSEotherEND (注:各分支返回的数据类型需一致。)
public class SqlIfElseStatement : Microsoft.SqlServer.Management.SqlParser.SqlCodeDom.SqlConditionalStatementInheritance Object SqlCodeObject SqlStatement SqlConditionalStatement SqlIfElseStatement Properties 展开表 BoundObject (Inherited from SqlCodeObject) Children ...
This Oracle tutorial explains how to use the IF-THEN-ELSE statement in Oracle with syntax and examples. In Oracle, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
Performance Due to the conditional checks, it is slower Since the same value is assigned to every row, it is faster Method 3: Updating Multiple Columns in MySQL This method can be used when we need to update multiple attributes of a record in a single query. Syntax: UPDATE table_name SET...
This SQL Server tutorial explains how to use the IF...ELSE statement in SQL Server (Transact-SQL) with syntax and examples. In SQL Server, the IF...ELSE statement is used to execute code when a condition is TRUE, or execute different code if the conditio
功能 当if语句不满足时所执行的代码块的入口 用法 if bool_result : do else: elsedo # else...
SQL SELECT Statement - Learn the SQL SELECT statement to retrieve data from your database efficiently. Explore examples and syntax to master SQL queries.
SQL_TIMESTAMP、SQL_TINYINT、 SQL_TSI_DAY、SQL_TSI_FRAC_SECOND、SQL_TSI_HOUR、SQL_TSI_MICROSECOND、SQL_TSI_MINUTE、SQL_TSI_MONTH、 SQL_TSI_QUARTER、 SQL_TSI_SECOND、SQL_TSI_WEEK、SQL_TSI_YEAR、SQL_VARBINARY、SQL_VARCHAR、STATE、STATEMENT、STRING_AGG、STRUCTURE、STYLE、SUBCLASS_ORIGIN、...
IF…THEN…ELSE IF…THEN…ELSIF…ENDIF First variant of IF statement: Simple IF THEN This is a single level conditional statement. This conditional structure is commonly used to manipulate the data in the tables from the command prompt.
The DECODE Function : Facilitates conditional inquiries by doing the work of a CASE or IF-THEN-ELSE statement. The DECODE function decodes an expression in a way similar to the IF-THEN-ELSE logic used in various languages. The DECODE function decodes expression after comparing it to each sear...