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The term query is often used to refer to a specific instance of a search. In a broader sense, a query can also refer to an external file that saves the search logic of an entire search history. These files are given a .QRY extension, and are saved and executed from within Concordance by means of the Search Execute submenu items. Unlike a snapshot, a query references the data that s in a database at the time that the query is executed, not when the query is saved. If a query had resulted in no records when it was saved, and then that query is executed a week later after data has been modified or added to the Concordance database the number of matches might be different. In this way, you can use a query to determine how data in a database has changed. As described in the earlier section, Snapshots, when a snapshot is opened, any current search history is destroyed and replaced by the search history saved in the snapshot. However, when a query is opened, the behavior is different: any current search history isn t destroyed, and the search logic contained in the external query file is appended to the current search history and numbered accordingly. Thus, if the current search history displays queries 00000, 00001, and 00002, and a query with two entries is opened, those entries are assigned numbers 00003 and 00004. The format of an external query file is highly structured, and may be modified in a text editor. The format is as follows, where search logic refers to an actual search phrase that must be syntactically correct: SEARCH: SEARCH: SEARCH: ... SEARCH: search logic search logic search logic search logic

The Oracle DBMS also supports deferrable constraints, allowing you to specify when you want the constraints to be checked. These are the two possibilities: IMMEDIATE checks at the statement level. DEFERRED checks at the end of the transaction.

Each search logic entry can be no longer than 200 characters in length. Concordance ignores any line in the external query file that doesn t begin with exactly the characters SEARCH:, and may use them as comment lines. From the user s perspective, external queries can reference complex chains of previous search logic. Because the search phrases are saved in the file, you re not required to retype long or tedious strings of search logic. If certain aspects of research are similar across databases, and those databases are structured appropriately, external queries can provide a starting point in a trail of discovery. You can also use queries to check for hot documents that match a string of search logic as data in Concordance is modified or added. There s no way to cause a query to auto-load in the same way that snapshots can be automatically loaded by means of the Auto restore feature.

One or more columns in the table should contain data that is unique for each row in the table, and preferably one that will not change over the life of the application this is called the PRIMARY KEY If the table has no such columns, we can add an artificial one containing an INTEGER, which the database will increment by one for us every time we enter a new row This is called an AUTO INCREMENT field The primary key is not restricted to being just one column The user_roles table contains only rows with unique user_id and role_id pairs, so the primary key can consist of those two columns The column or columns in the primary key will form a UNIQUE INDEX, and the database will automatically create this index It will prevent entry of rows with duplicate primary keys.

Before you can use this distinction, you must first allow a constraint to be deferrable. The default option for all constraints that you create is NOT DEFERRABLE. If you want your constraints to be deferrable, add the DEFERRABLE option in the constraint definition, as shown in Figure 7-9, just before the storage clause specification (see Figures 7-6 and 7-8).

Figure 7-9. DEFERRABLE option for constraint definitions If you allow constraints to be deferrable using the DEFERRABLE option, they still have a default behavior of INITIALLY IMMEDIATE. The INITIALLY option allows you to specify the desired default constraint checking behavior, using IMMEDIATE or DEFERRED. You can dynamically change or override the default behavior of deferrable constraints at the transaction level with the SET CONSTRAINTS command, as shown in Figure 7-10.

You can save queries to an external file by means of the Search Keep menu. This opens a Keep Queries dialog box, where you can name and save the query accordingly. Queries are stored by default in the same folder in which the primary database files are stored.