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Updating multiple tables in mssql
Each named column is set to the value of the expression on the right-hand side of the equal sign.
If the FROM clause specifies a one-to-many join and the SET clause references a cell from the “many” side of the join, the cell is updated from the first value selected.
In other words, if the join condition causes multiple rows of the table to be updated per row ID, the first row returned becomes the update result.
For example: Normally, the order in which rows are updated does not matter.
However, in conjunction with the NUMBER(*) function, an ordering can be useful to get increasing numbers added to the rows in some specified order.
If you are not using the NUMBER(*) function, avoid using the ORDER BY clause, because the UPDATE statement performs better without it.
In an UPDATE statement, if the NUMBER(*) function is used in the SET clause and the FROM clause specifies a one-to-many join, NUMBER(*) generates unique numbers that increase, but do not increment sequentially due to row elimination.For more information about the NUMBER(*) function, see “NULLIF function [Miscellaneous]” in Chapter 4, “SQL Functions” in Reference: Building Blocks, Tables, and Procedures.You can use the ORDER BY clause to control the result from an UPDATE when the FROM clause contains multiple joined tables.Sybase IQ ignores the ORDER BY clause in searched UPDATE and returns a message that the syntax is not valid ANSI syntax.If no WHERE clause is specified, every row is updated.If you specify a WHERE clause, Sybase IQ updates only rows satisfying the search condition.The left side of each SET clause must be a column in a base table.Views can be updated provided the SELECT statement defining the view does not contain a GROUP BY clause or an aggregate function, or involve a UNION operation. Character strings inserted into tables are always stored in the case they are entered, regardless of whether the database is case sensitive or not.Thus a character data type column updated with a string Value is always held in the database with an uppercase V and the remainder of the letters lowercase. If the database is not case sensitive, however, all comparisons make Value the same as value, VALUE, and so on.The IQ server may return results in any combination of lowercase and uppercase, so you cannot expect case sensitive results in a database that is case insensitive (CASE IGNORE).Further, if a single-column primary key already contains an entry Value, an INSERT of value is rejected, as it would make the primary key not unique.