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List the names and owners of all tables in the entire database.
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SELECT TABLE_NAME, OWNER FROM DBA_TABLES;
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List the names of all tables owned by the current user.
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SELECT TABLE_NAME FROM USER_TABLES;
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The SQL Server equivalent of the DB2 SYSCAT.TABLES view is a catalog view named SYS.OBJECTS, described in Table 16-4. The SYS.OBJECTS view stores information about SQL Server tables and views and other SQL Server objects such as stored procedures, rules, and triggers. Note also how the SYS.OBJECTS table uses an internal ID number (principal_id) instead of a name to identify the table owner. The Informix Universal Server system table that gives information about tables is named SYSTABLES. Like the DB2 catalog, it contains information only about tables, views, and aliases; other database objects are described in other system tables. Here is a typical query against this Informix system table: List the name, owner, and creation date of all tables in the database.
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SELECT TABNAME, OWNER, CREATED FROM SYSTABLES WHERE TABTYPE = 'T';
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As these examples show, the queries to obtain table information have a similar structure across DBMS brands. However, the specific names of the system table(s) or view(s) containing the information, and the relevant columns, vary considerably across brands.
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The System Catalog
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Column Name Name object_id schema_id principal_id parent_object_id type
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Data Type sysname int int int int char(2)
Information Name of the object Internal object ID number ID of the schema that contains the object ID of the individual object owner, if different than the schema owner ID of the object to which this object belongs (0 if not a child object) Object type, such as: C = CHECK constraint D = Default or DEFAULT constraint F = FOREIGN KEY constraint P = Stored procedure PK = PRIMARY KEY constraint S = System table TR = Trigger U = User table (plus many other values) Date/time object was created Date/time object was last modified Whether object is created by an internal SQL Server component or not Whether object is published or not
create_date modify_date is_ms_shipped is_published is_schema_ published
TABLE 16-4
datetime datetime bit bit bit
PART IV
Whether only the schema of the object is published or not
Columns of the SYS.OBJECTS Catalog View (SQL Server)
Column Information
All of the major SQL products have a system table that keeps track of the columns in the database. There is one row in this table for each column in each table or view in the database. Most DBMS brands restrict access to this base system table, but provide user column information through a view that shows only columns in tables owned by, or accessible to, the current user. In an Oracle database, three system catalog views provide this information USER_TAB_COLUMNS, which includes one row for each column in each table owned by the current user; ALL_TAB_COLUMNS, which contains one row for each column in each table accessible to the current user; and DBA_TAB_COLUMNS, which contains one row for each column in each table in the entire database. Most of the information in the system columns table or view stores the definition of a column its name, its data type, its length, whether it can take NULL values, and so on. In addition, the table sometimes includes information about the distribution of data values found in each column. This statistical information helps the DBMS decide how to carry out a query in the optimal way.
Part IV:
Database Structure
Here is a typical query you could use to find out about the columns in an Oracle database: List the names and data types of the columns in my OFFICES table.
SELECT COLUMN_NAME, DATA_TYPE FROM USER_TAB_COLUMNS WHERE TABLE_NAME = 'OFFICES';
Like the table information in the system catalog, the column information varies across DBMS brands. Table 16-5 shows the contents of the SYSCAT.COLUMNS system table, which
Column Name TABSCHEMA TABNAME COLNAME COLNO TYPESCHEMA TYPENAME LENGTH SCALE DEFAULT NULLS CODEPAGE LOGGED COMPACT COLCARD HIGH2KEY LOW2KEY AVGCOLLEN KEYSEQ PARTKEYSEQ NQUANTILES NMOSTFREQ REMARKS
TABLE 16-5
Data Type VARCHAR(128) VARCHAR(128) VARCHAR(128) SMALLINT VARCHAR(128) VARCHAR(18) INTEGER SMALLINT VARCHAR(254) CHAR(1) SMALLINT CHAR(1) CHAR(1) BIGINT VARCHAR(254) VARCHAR(254) INTEGER SMALLINT SMALLINT SMALLINT SMALLINT VARCHAR(254)
Information Schema of table containing the column Name of table containing the column Name of the column Position of column in table (first column = 0) Schema of column s domain (or SYSIBM) Name of data type or domain for column Maximum data length for variable-length types Scale for DECIMAL data types Default value for column Whether NULLs are allowed (Y/N) Code page for extended character types Whether logging is enabled (Y/N) for large object columns Whether large object column is compacted (Y/N) Number of distinct data values (cardinality) Second-highest column value in table Second-lowest column value in table Average data length for variable-length types Column position within primary key (or 0) Column position within partitioning key (or 0) Number of quantiles in column statistics Number of frequent values in column statistics User-supplied comments for column
Selected Columns in the SYSCAT.COLUMNS View (DB2)
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