这是因为在SQL中,NULL是一种特有的数据类型,其等价于没有任何值、是未知数。NULL与0、空字符串、空格都不同。 ANSI SQL标准中取得Null值的行需要用下面的查询: SELECT * FROM test WHERE data IS NULL 由此可见非ANSI SQL标准中data=NULL等同于dataIS NULL,data<>NULL等同于dataIS NOT NULL。 所以我们要牢...
When writing T-SQL, a lot of developers use eitherCOALESCEorISNULLin order to provide a default value in cases where the input is NULL. They have various reasons for their choice, though sometimes this choice may be based on false assumptions. Some think that ISNULL is always faster than ...
java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (USR_JXZX_DSJKF_MODEL.SYS_C001362707) violated 主键不一致,须联系数据中心修改 经DataX智能分析,该任务最可能的错误原因是: com.alibaba.datax.common.exception.DataXException: Code:[Framework-14], Description:[DataX传输脏数据...
SQL Server does not support the NVL2 function (it is worth mentioning that ORACLE supports it). This function accepts three parameters and returns the value of the second parameter if the first parameter is not NULL. Otherwise, it returns the value of the third parameter. It extends...
已解决: nested exception is java.sql.SQLDataException: ORA-01476: divisor is equal to zero 问题 oracle 除零异常,且sql重复语句过多 思路 使用decode 或者 NULLIF 解决除零异常问题 原SQL case when冗余 可以用 case when in 简化 解决 在这个修改后的SQL语句中,NULLIF函数用于处理zzje、zxjje和jxjje计算...
NULL is a special value in SQL that represents a missing or an unknown value. NULL is used for fields with unknown or inapplicable values. It's different from an empty or zero value. No two NULL values are equal. Any field in a table can be defined to allow (or not allow) NULL val...
oracle除零异常,且sql重复语句过多 思路 使用decode 或者 NULLIF 解决除零异常问题 原SQL case when冗余 可以用 case when in 简化 解决 在这个修改后的SQL语句中,NULLIF函数用于处理zzje、zxjje和jxjje计算中的被零除错误。如果分母为零,则NULLIF函数返回NULL,防止被零除的错误。
COALESCE and ISNULL perform about the same (inmostcases) in SQL Server Different people have run different tests comparing ISNULL and COALESCE, and have come up withsurprisingly different results. I thought I would introduce a new test based on SQL Server 2012 to see if my results show anythi...
Hi Roy Lyseng. I see. Is it possible to make this behave the same as sql mode mysql5.7? Please let me know if you know. Thank you so much. [11 Jan 2024 7:55] Roy Lyseng This special syntax was introduced for the purpose of dealing with temporal "zero" values from connectors, and...
Adding NOT NULL DEFAULT VALUE column to existing table with data Adding of counter column Adding varchar(8) in time format that totals more than 24 hrs in SQL Additional Column With BULK INSERT Adventureworks query about sales AFTER INSERT and AFTER UPDATE triggers on same table After INSERT Tr...