More strictly than the regular syntax check. When UNION is used, the syntax check is performed in a Subquery in the WHERE condition or after INSERT. The addition UNION can also be used in the statement OPEN CURSOR or in a When UNION is used, the SELECT statement bypasses SAP buffering. The addition DISTINCT also removes any duplicate rows produced by the addition ALL of preceding UNION additions. The default behavior or the addition DISTINCT are always applied to the fullĮxisting results set. Priorities using parentheses are particularly applicable when handling duplicate rows using DISTINCT. SQL expressions, host expressions, and host variables can be used to synchronize the columns of the results set of the SELECT statements in question. If required, the column names of the individual results sets can be modified using alternative column names after AS.ĭF34_DEC can only be used together in a column if their decimal places match. The number of SELECT statements, which can be linked using UNION, is not limited by a fixed value.Įach of the associated SELECT statements has its ownĬLIENT SPECIFIED applies only to the SELECT statement for which it is specified. The addition UP TO n ROWS is not allowed. Is not allowed in the WHERE conditions of the SELECT statements in question. The addition ORDER BY PRIMARY KEY is not allowed. If the addition CORRESPONDING or an inline declaration used in the INTO clause, the column names of all results sets from left to right must match.Ĭolumns of the results set specified after ORDERīY must also have the same name in all SELECT statements in question. The corresponding special typesĪll other types must be exactly the same. The resulting column has the data type with the greatest length. Character-like types CHAR can have different lengths.The corresponding special typesĭF34_DEC are handled like the numbers of typeĭEC (as they are saved) and the rule above applies with respect to lengths and decimal places. Numeric types DEC can have different lengths,īut must have the same number of digits after the decimal point.The resulting column has the data type with the greatest value range. Predefined data type, length, and number of digits after the decimal point, with the following exceptions: The columns assigned to each other must have the same type attributes with respect to SELECT statements grouped using UNION must have the same number of elements. That can cover the data sources and SQL expressions, including host variables and host expressions. Using UNION as to a single SELECT statement, with the following exceptions: The same applies to the clauses and additions of the SELECT statements grouped TABLE), a loop closed using ENDSELECT is always opened. SELECT statement without the addition INTO |APPENDING. If an assignment is made to a non-table-like target are (meaning a Is always regarded as a multirow set and the addition The results set of SELECT statements joined using UNION Specific statements can be prioritized using parentheses. The SELECT statements associated with UNION are evaluated from left to right. All duplicate rows are then deleted except for one (including all columns of the results set). Is specified, the rows of the results set of the right SELECT statement are If the addition DISTINCT is specified or if neither of the two additions If the addition ALL is specified, all rows from the results set of the right SELECT statement are inserted into the existing results set. The additions ALL and DISTINCT specify how duplicate rows are handled. Right side of UNION can itself contain a UNION addition and be enclosed in parentheses (Ĭlause and the INTO clause are applied to the union results set and must be specified after the position of the last closing parenthesis. The SELECT statements on the left and right of UNION The columns of the results set keep the names defined in the SELECT statement on the left of UNION. Of UNION are inserted into the results set of the SELECT The rows of the results set of the SELECT statement on the right The addition UNION creates the union of the results sets of two SELECT SAP NetWeaver AS ABAP Release 750, ©Copyright 2016 SAP AG.
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