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It is often useful or necessary to know what identity value was generated by an INSERT command. Microsoft SQL Server provides several functions to do this: @@IDENTITY provides the last value generated on the current connection in the current scope, while IDENT_CURRENT(tablename) provides the last value generated, regardless of the connection or scope it was created on.
An SQL UPDATE statement changes the data of one or more records in a table. Either all the rows can be updated, or a subset may be chosen using a condition. The UPDATE statement has the following form: [1] UPDATE table_name SET column_name = value [, column_name = value ...] [WHERE condition]
The post-increment and post-decrement operators increase (or decrease) the value of their operand by 1, but the value of the expression is the operand's value prior to the increment (or decrement) operation. In languages where increment/decrement is not an expression (e.g., Go), only one version is needed (in the case of Go, post operators only).
The default start+increment form with the start value of 1 and increment of 1 is not suitable for all circumstances. There are reasons to choose each form, and trade-offs in doing so. [2] The default start and increment values might reveal information about a table that it is desired not to reveal to people viewing individual table rows.
Additionally there is a single-row version, UPDATE OR INSERT INTO tablename (columns) VALUES (values) [MATCHING (columns)], but the latter does not give you the option to take different actions on insert versus update (e.g. setting a new sequence value only for new rows, not for existing ones.)
Canada's ruling Liberal Party is looking for a new leader to replace Prime Minister Justin Trudeau, who announced on Monday he intended to step down. Finance Minister Dominic LeBlanc said on ...
HRAs, QSEHRAs, and ICHRAS. Understanding the differences in eligible expenses between HRAs, QSEHRAs, and ICHRAs can help businesses determine which type of plan best fits their needs.
European stocks also nudged down, off 0.1%, not helped by soft business activity data from Germany, which showed a sixth straight month of contraction, and France. That left MSCI's world share ...