The OracleNULLIF()function accepts two arguments. It returns a null value if the two arguments are equal. In case the arguments are not equal, theNULLIF()function returns the first argument. The following illustrates the syntax of the OracleNULLIF()function: NULLIF(e1, e2);Code language:SQL ...
SQL> insert into t1 values(9);--插入3行数据,数据值都是9 SQL> create or replace function sleep_now return number is 2 i number; 3 begin 4 i :=0; 5 while8 6 i<=1000000 7 loop 8 i :=i+1; 9 end loop; 10 return i; 11 end; 12 / --创建一个sleep_now函数,目的是为了加长sql...
The NULLIF function is logically equivalent to the following CASE expression: Copy CASE WHEN expr1 = expr2 THEN NULL ELSE expr1 END See Also: "CASE Expressions" Appendix C in Oracle Database Globalization Support Guide for the collation determination rules, which define the collation NULLIF us...
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SQL> create or replace function sleep_now return number is 2 i number; 3 begin 4 i :=0; 5 while8 6 i<=1000000 7 loop 8 i :=i+1; 9 end loop; 10 return i; 11 end; 12 / --创建一个sleep_now函数,目的是为了加长sql执行的时间 ...
MySQL offers two methods for determining a NULL value and replacing it with another. In SQL Server the function IFNULL is available and in Oracle NVL. However, standard standard SQL shows us that the COALESCE function is standard ANSI SQL and would standardize your SQL code. ...
SIMILAR TO POSIX 運算子 BETWEEN 範圍條件 Null 條件 EXISTS 條件 IN 條件 SQL 命令 ABORT ALTER DATABASE ALTER DATASHARE ALTER DEFAULT PRIVILEGES ALTER EXTERNAL SCHEMA ALTER 外部檢視 ALTER FUNCTION ALTER GROUP ALTER IDENTITY PROVIDER ALTER MASKING POLICY ...
Oracle、Teradata和MySQL语法兼容性差异 表达式case、coalesce、if、ifnull入参类型不同 报错 兼容TD行为,支持数字和字符串之间的类型转换,比如coalesce参数输入int和varchar类型,解析成varchar类型。 兼容MySQL行为,支持其他类型和字符串之间的类型转换,比如coalesce参数输入date、int和varchar类型,解析成varchar类型。
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The Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the NULLIF function returns NULL. Otherwise, it returns expr1.Syntax The syntax for the NULLIF function in Oracle/PLSQL is: NULLIF( expr1, expr2 ) Parameters or Arguments expr1 First value to compa...