Index_U

U

UNDEFINE command, 155, 157

UNDER clause, 382

underscore character (_), 40

undoing changes. See ROLLBACK

Unicode, converting to and from, 472

UNION ALL operator, 184 “185, 535 “536

UNION operator, 185 “187, 535 “536

unique constraint violated (error), 253

UNIQUE constraints, adding, 303

unique index, 317

Unix

environment variables for Java, 477 “478

forward slash character (/) for directories, 10,  433

LD_LIBRARY_PATH environment variable, 480

UPDATE privilege, 278

UPDATE statements, 21 “22, 374, 376, 379 “380, 431 “432

containing subqueries, 178

DEFAULT keyword in, 256

modifying rows using, 250 “252

SET clause in, 251

UPDATE TABLE, 398 “399

updating cells , 243 “244

UPPER() function, 62, 67, 317

UROWID data type, 555

user_col_comments table, 308

user_col_privs_made view, 279 “280

user_col_privs_recd view, 281 “282

user_cons_columns view, 306

user_constraints view, 305, 326

user -defined constructors, 385 “387

user-defined types, 368, 555

user_ind_columns view, 318 “319

user_indexes view, 318 “319

user_nested_tables view, 397

user_procedures view, 350 “351

user_role_privs view, 286 “287

users, 272 “274

creating, 272 “273

deleting, 274

user's password, changing, 273 “274

user_sequences view, 311 “312

user_sys_privs view, 275 “276

user_tab_columns view, 297

user_tab_comments view, 308

user_tables view, 296

user_tab_privs_made view, 278

user_tab_privs_recd view, 280

user_triggers view, 362 “363

user_varrays view columns , 392 “393

user_views view, 325

USING clause

with inner joins, 57

for joins, 56 “57

in MERGE statement, 257

UTC (Coordinated Universal Time), 120

utlxplan.sql, 542 “543