❮Previous❮ SQL Server FunctionsNext❯ ExampleGet your own SQL Server Compare two expressions: SELECTNULLIF(25,25); Try it Yourself » Definition and Usage The NULLIF() function returns NULL if two expressions are equal, otherwise it returns the first expression. ...
SELECTsalesman_id,CASEWHENcurrent_year = previous_yearTHEN'Same as last year'ELSETO_CHAR(current_year)ENDFROMbudgetsWHEREcurrent_yearISNOTNULL;Code language:SQL (Structured Query Language)(sql) In this tutorial, you have learned how to use the OracleNULLIF()function to return a null if the fi...
SQL> create table t1 (i int);--创建t1临时表 SQL> insert into t1 values(9); 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 ...
Function list in alphabetical order abs function acos function acosh function add_months function aes_decrypt function aes_encrypt function aggregate function ai_analyze_sentiment function ai_classify function ai_extract function ai_fix_grammar function ai_forecast function ai_gen function ai_generate_text...
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL.We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluated twice and to return ...
ExampleGet your own SQL Server Compare two expressions: SELECT NULLIF(25, 25); Try it Yourself » Definition and UsageThe NULLIF() function compares two expressions and returns NULL if they are equal. Otherwise, the first expression is returned....
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 ...
l Create function fun_sumScore l { l @parClassNo as varchar(10) } l Returns real l Begin l Declare @sumScore real l Select @sumScore = sum(score) l From t_score l Where classNo=@parClassNo l Return @sumScore l End l 使用自定义函数: select dbo. fun_sumScore(‘12312’) from...
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluated twice and to return...
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluated twice and to return...