CREATE TABLE SYS.SYSIXCOL ( table_id UNSIGNED INT NOT NULL, index_id UNSIGNED INT NOT NULL, sequence SMALLINT NOT NULL, column_id UNSIGNED INT NOT NULL, "order" CHAR(1) NOT NULL, PRIMARY KEY ( table_id, index_id, sequence ), FOREIGN KEY REFERENCES SYS.SYSINDEX, FOREIGN KEY REFERENCES SYS.SYSCOLUMN )
Every index has one row in SYSIXCOL for each column in the index.
table_id Identifies the table to which the index applies.
index_id Identifies in which index this column is used. Together, table_id and index_id identify one index described in SYSINDEX.
sequence Each column in an index is assigned a unique number starting at 0. The order of these numbers determines the relative significance of the columns in the index. The most important column has sequence number 0.
column_id The column number identifies which column is indexed. Together, table_id and column_id identify one column in SYSCOLUMN.
“order” Indicates whether this column in the index is kept in ascending or descending order (“A” or “D”).
