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A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE or DELETE existing records depending on whether condition matches. It was officially introduced in the SQL:2003 standard, and expanded [citation needed] in the SQL:2008 standard.
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Represents a range of dates. Template parameters Parameter Description Type Status Start year 1 year1 Year the event started Example 1920 Number required Start month 2 month1 Month the event started Example June String required Start day 3 day1 Day the event started Example 9 String suggested End year 4 year2 Year the event ended Example 1969 Number required End month 5 month2 Month the event ...
Title Authors ----- ----- SQL Examples and Guide 4 The Joy of SQL 1 An Introduction to SQL 2 Pitfalls of SQL 1 Under the precondition that isbn is the only common column name of the two tables and that a column named title only exists in the Book table, one could re-write the query above in the following form:
The Log Trigger works writing the changes (INSERT, UPDATE and DELETE operations) on the table in another, history table, defined as following: CREATE TABLE HistoryTable ( Column1 Type1 , Column2 Type2 , : : Columnn Typen , StartDate DATETIME , EndDate DATETIME )
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The Start date and age template displays the date that an event or entity started or was created. Template parameters Parameter Description Type Status Year 1 A four-digit number indicating the year Example 2017 Number required Month 2 A number between 1 and 12 indicating the month Example 12 Number suggested Day 3 A number between 1 and 31 indicating the day of the month Example 31 Number ...