SQL server:case judgment NULL, error One example

Source: Internet
Author: User

-----Error judgment------------------------------------------------------------------------------------SELECT policy_jq_ No,policy_sy_no,Case Policy_jq_noWhen "then"Policy_sy_noELSEPolicy_jq_noEND policy_noFrom Zy_survey_visit ORDER BY flow_id desc--- Correct judgment-----------------------------------------------------------------------------SELECT Policy_jq_no,policy_sy_ No CaseWhen Policy_jq_no was NULL thenPolicy_sy_noELSE Policy_jq_noend policy_nofrom zy_survey_visit ORDER BY flow_id Desc

SQL server:case judgment NULL, error One example

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